Average Rating:7.18
Bayesian Rating:7.11
Total Votes:83
Updated 8 days ago
Ryuuya has an older sister, Miya. He lives a peaceful school life with his friends. But one day, he and his friends accidentally drink a medicine juice. Once you drink it, you'll become sexually sensitive and get sexually excited soon. Especially the breasts of the girls who drink it will get bigger and they will need to have sex to cool down. Also, to make a vaccine, they will need to get pregnant. Like this, Ryuuya starts having sex with the girls to cool them down and make a vaccine...! [From ErogeShop]
Oppai Heart ~Kanojo wa Kedamono Hatsujouki!?~ has not appeared in our Steam sample enough to calculate it's similar novels... sorry!
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| Name | Characters | Importance | Weight |
|---|---|---|---|
| Sex in School Infirmary Engages in (Sexual) | 5 | 2.22 | 3.99 |
| Breast Expansion Subject of | 4 | 2.40 | 3.87 |
| Lace Lingerie Clothes | 5 | 2.10 | 3.76 |
| Inflated Belly Subject of (Sexual) | 5 | 2.04 | 3.66 |
| Sexual Animal Cosplay Engages in (Sexual) | 3 | 2.52 | 3.50 |
| Nipple Sucking Engages in (Sexual) | 6 | 1.70 | 3.30 |
| Nipple Teasing Engages in (Sexual) | 4 | 2.01 | 3.24 |
| Ball-cupping Engages in (Sexual) | 3 | 2.33 | 3.23 |
| Thong Panties Clothes | 3 | 2.30 | 3.19 |
| Sex in Classroom Engages in (Sexual) | 6 | 1.61 | 3.12 |
| Sex in Front of an Audience Engages in (Sexual) | 6 | 1.50 | 2.92 |
| Gokkun Engages in (Sexual) | 3 | 2.04 | 2.83 |
| Nipple Teasing Subject of (Sexual) | 5 | 1.57 | 2.81 |
| Bellyjob Subject of (Sexual) | 1 | 3.82 | 2.65 |
| French Kiss Engages in (Sexual) | 5 | 1.48 | 2.65 |
| Buttjob Engages in (Sexual) | 2 | 2.39 | 2.63 |
| Bodysponge Engages in (Sexual) | 2 | 2.38 | 2.62 |
| Magic Wand Subject of (Sexual) | 2 | 2.37 | 2.60 |
| Student Council Member Role | 2 | 2.37 | 2.60 |
| Microskirt Clothes | 2 | 2.35 | 2.58 |
| High Heeled Boots Clothes | 2 | 2.24 | 2.46 |
| Sexual Cosplay Engages in (Sexual) | 2 | 2.24 | 2.46 |
| Female Ejaculation Engages in (Sexual) | 5 | 1.36 | 2.44 |
| Brooch Clothes | 2 | 2.22 | 2.44 |
| Torn Pantyhose (damaged) Clothes | 2 | 2.21 | 2.42 |
| Bukkake Subject of (Sexual) | 5 | 1.35 | 2.42 |
| Reverse Missionary Subject of (Sexual) | 3 | 1.74 | 2.41 |
| Mules Clothes | 1 | 3.46 | 2.40 |
| Sport Bloomers Clothes | 3 | 1.72 | 2.38 |
| Non-blood-related Incest Engages in (Sexual) | 2 | 2.15 | 2.37 |
| Seventh Posture Subject of (Sexual) | 4 | 1.46 | 2.35 |
| Court Shoes Clothes | 2 | 2.11 | 2.32 |
| Tribadism on Penis Engages in (Sexual) | 2 | 2.08 | 2.29 |
| Group Sex of One Male and Several Females Engages in (Sexual) | 6 | 1.17 | 2.28 |
| Bellyjob Engages in (Sexual) | 1 | 3.27 | 2.27 |
| Boobs on Fence Subject of (Sexual) | 1 | 3.27 | 2.27 |
| Reverse Cowgirl Subject of (Sexual) | 3 | 1.63 | 2.26 |
| Sex in Public Places Engages in (Sexual) | 5 | 1.26 | 2.25 |
| Anal Fingering Engages in (Sexual) | 2 | 2.05 | 2.25 |
| Sixty-nine Engages in (Sexual) | 5 | 1.26 | 2.25 |
| Anilingus Subject of (Sexual) | 2 | 2.04 | 2.25 |
| Shoejob Subject of (Sexual) | 1 | 3.21 | 2.22 |
| Nipple Sucking Subject of (Sexual) | 4 | 1.38 | 2.22 |
| Dog Cosplay Engages in | 1 | 3.20 | 2.22 |
| Ankle Socks Clothes | 2 | 2.01 | 2.21 |
| Vaginal Gaping Engages in (Sexual) | 2 | 1.95 | 2.14 |
| Piledriver Subject of (Sexual) | 2 | 1.94 | 2.13 |
| Mutual Masturbation Engages in (Sexual) | 2 | 1.94 | 2.13 |
| Paw Gloves Clothes | 1 | 3.03 | 2.10 |
| Cunnilingus Subject of (Sexual) | 5 | 1.16 | 2.08 |
| Serious Personality | 3 | 1.49 | 2.06 |
| Sailor School Uniform Clothes | 3 | 1.48 | 2.05 |
| Big Breasts Body | 5 | 1.13 | 2.03 |
| Intercrural Sex Engages in (Sexual) | 2 | 1.84 | 2.03 |
| Reverse Spitroast Subject of (Sexual) | 2 | 1.84 | 2.02 |
| Shoejob Engages in (Sexual) | 1 | 2.90 | 2.01 |
| Knee-high Boots Clothes | 2 | 1.83 | 2.01 |
| Blazer Clothes | 2 | 1.83 | 2.01 |
| Sitting Sex Engages in (Sexual) | 2 | 1.82 | 2.00 |
| Bodysponge Subject of (Sexual) | 1 | 2.89 | 2.00 |
| Missionary Subject of (Sexual) | 5 | 1.12 | 2.00 |
| Evening Gloves Clothes | 2 | 1.81 | 1.99 |
| Tribadism on Penis Subject of (Sexual) | 1 | 2.86 | 1.98 |
| Latex Thigh-high Boots Clothes | 1 | 2.86 | 1.98 |
| Petting With Object Subject of (Sexual) | 1 | 2.85 | 1.98 |
| Pantyhose Clothes | 3 | 1.42 | 1.98 |
| Prostate Massage Engages in (Sexual) | 1 | 2.84 | 1.97 |
| Twin Boobjob Engages in (Sexual) | 2 | 1.77 | 1.94 |
| Vaginal Fingering Subject of (Sexual) | 5 | 1.08 | 1.93 |
| Hetare Personality | 1 | 2.78 | 1.93 |
| Buttjob Subject of (Sexual) | 1 | 2.78 | 1.93 |
| Fishnet Pantyhose Clothes | 1 | 2.78 | 1.93 |
| Bathroom Sex Engages in (Sexual) | 3 | 1.39 | 1.92 |
| Latex Long Gloves Clothes | 1 | 2.76 | 1.92 |
| Knee-high Socks Clothes | 3 | 1.38 | 1.91 |
| Lesbian Sex Engages in (Sexual) | 3 | 1.38 | 1.91 |
| Cheerleader Role | 1 | 2.75 | 1.91 |
| Tube Top Bra Clothes | 1 | 2.74 | 1.90 |
| Butterfly Subject of (Sexual) | 4 | 1.17 | 1.89 |
| Sports Shoes Clothes | 2 | 1.72 | 1.89 |
| Loafers Clothes | 2 | 1.71 | 1.88 |
| Anal Fingering Subject of (Sexual) | 2 | 1.71 | 1.88 |
| Tominagi Subject of (Sexual) | 3 | 1.36 | 1.88 |
| Handjob Engages in (Sexual) | 4 | 1.16 | 1.86 |
| Twin Boobjob Subject of (Sexual) | 1 | 2.68 | 1.85 |
| Balls Sucking Subject of (Sexual) | 1 | 2.67 | 1.85 |
| Pubic Hair Hair | 3 | 1.34 | 1.85 |
| Strapless Leotard Clothes | 1 | 2.67 | 1.85 |
| Student Council Vice President Role | 1 | 2.66 | 1.84 |
| Breast Smothering Engages in (Sexual) | 1 | 2.65 | 1.83 |
| Ahegao Engages in (Sexual) | 3 | 1.32 | 1.83 |
| Collar Clothes | 2 | 1.66 | 1.83 |
| Strapless Mini-dress Clothes | 1 | 2.63 | 1.82 |
| T-shirt Clothes | 3 | 1.31 | 1.82 |
| Cheerleading Uniform Clothes | 1 | 2.62 | 1.82 |
| Bunnygirl Cosplay Engages in | 1 | 2.61 | 1.81 |
| Pantyjob Engages in (Sexual) | 1 | 2.60 | 1.80 |
| Kouhai Role | 2 | 1.63 | 1.79 |
| Senpai Role | 2 | 1.61 | 1.77 |
| Piledriver Engages in (Sexual) | 1 | 2.55 | 1.77 |
| Hair Beads Hair | 1 | 2.53 | 1.75 |
| Whip Items | 1 | 2.52 | 1.75 |
| Halterneck Dress Clothes | 1 | 2.50 | 1.74 |
| Sports Swimsuit Clothes | 1 | 2.49 | 1.72 |
| Tube Top Clothes | 1 | 2.48 | 1.72 |
| Boobjob Engages in (Sexual) | 4 | 1.07 | 1.72 |
| Sex in Water Engages in (Sexual) | 2 | 1.56 | 1.72 |
| Cowgirl Subject of (Sexual) | 5 | 0.95 | 1.71 |
| School Nurse Role | 1 | 2.46 | 1.71 |
| Bunny Dress Clothes | 1 | 2.46 | 1.71 |
| Peaked Cap Clothes | 1 | 2.46 | 1.70 |
| Cunnilingus Engages in (Sexual) | 2 | 1.55 | 1.70 |
| Classmate Role | 3 | 1.23 | 1.70 |
| Homeroom Teacher Role | 1 | 2.45 | 1.70 |
| Slit Dress Clothes | 1 | 2.45 | 1.70 |
| Refined Personality | 2 | 1.54 | 1.69 |
| Straight Hair | 5 | 0.94 | 1.69 |
| Latex Clothes | 1 | 2.43 | 1.69 |
| Step Sister Role | 1 | 2.43 | 1.69 |
| Pregnant Sex Engages in (Sexual) | 2 | 1.53 | 1.68 |
| Thigh-high Stockings Clothes | 4 | 1.04 | 1.68 |
| High School Student Role | 6 | 0.85 | 1.66 |
| Open Cup Bra Clothes | 1 | 2.38 | 1.65 |
| Non-blood-related Brother Role | 1 | 2.38 | 1.65 |
| Swim Shorts Clothes | 1 | 2.37 | 1.64 |
| Anal Gaping Engages in (Sexual) | 1 | 2.37 | 1.64 |
| Standing Sex Subject of (Sexual) | 3 | 1.18 | 1.63 |
| Outdoor Sex Engages in (Sexual) | 3 | 1.16 | 1.60 |
| Twin Blowjob Subject of (Sexual) | 1 | 2.31 | 1.60 |
| Sex on Roof Engages in (Sexual) | 1 | 2.29 | 1.59 |
| Pissing on Others Engages in (Sexual) | 1 | 2.27 | 1.57 |
| Balls Sucking Engages in (Sexual) | 1 | 2.25 | 1.56 |
| Athletics Engages in | 1 | 2.25 | 1.56 |
| V Bangs Hair | 2 | 1.41 | 1.55 |
| Gloves Clothes | 2 | 1.41 | 1.55 |
| Blowjob Duck Face Engages in (Sexual) | 1 | 2.23 | 1.55 |
| Rubber Band With Beads Clothes | 1 | 2.23 | 1.54 |
| Reverse Cowgirl Engages in (Sexual) | 1 | 2.22 | 1.54 |
| Spoons Engages in (Sexual) | 1 | 2.21 | 1.53 |
| Large Penis Body | 1 | 2.21 | 1.53 |
| Spats Clothes | 1 | 2.20 | 1.52 |
| Virgin Sex Engages in (Sexual) | 5 | 0.85 | 1.52 |
| Milking (Sexual) Subject of (Sexual) | 1 | 2.20 | 1.52 |
| Chinese Dress Clothes | 1 | 2.20 | 1.52 |
| Seventh Posture Engages in (Sexual) | 1 | 2.19 | 1.52 |
| Pissing Subject of (Sexual) | 1 | 2.18 | 1.51 |
| Footjob Subject of (Sexual) | 1 | 2.18 | 1.51 |
| Sexual Dominant Role | 1 | 2.16 | 1.50 |
| Quickie Fix Subject of (Sexual) | 3 | 1.08 | 1.50 |
| Shimapan Clothes | 1 | 2.13 | 1.48 |
| Sitting Sex Subject of (Sexual) | 3 | 1.06 | 1.47 |
| Mary Jane Clothes | 1 | 2.12 | 1.47 |
| Petplay Subject of (Sexual) | 1 | 2.10 | 1.46 |
| Ahoge Hair | 2 | 1.32 | 1.45 |
| Old Type School Swimsuit Clothes | 1 | 2.09 | 1.45 |
| Honor Student Role | 1 | 2.09 | 1.45 |
| Tiny Braid Hair | 1 | 2.07 | 1.44 |
| Student Council President Role | 1 | 2.07 | 1.43 |
| Honorable Personality | 1 | 2.07 | 1.43 |
| Curtained Hair | 2 | 1.30 | 1.43 |
| Brother Complex Personality | 1 | 2.06 | 1.43 |
| Bow Tie Clothes | 1 | 2.04 | 1.42 |
| Cloak Clothes | 1 | 2.04 | 1.41 |
| Kemonomimi Headband Clothes | 1 | 2.04 | 1.41 |
| Turtleneck Sweater Clothes | 1 | 2.04 | 1.41 |
| Optimist Personality | 1 | 2.03 | 1.41 |
| Hime Cut Hair | 1 | 2.02 | 1.40 |
| Spaulders Clothes | 1 | 2.01 | 1.39 |
| Anilingus Engages in (Sexual) | 1 | 2.01 | 1.39 |
| Vaginal Object Insertion Subject of (Sexual) | 1 | 2.00 | 1.39 |
| Yamato Nadeshiko Role | 1 | 2.00 | 1.38 |
| Decorative Belt Clothes | 1 | 1.98 | 1.37 |
| Parted in Middle Hair | 2 | 1.25 | 1.37 |
| Vibrator Subject of (Sexual) | 1 | 1.98 | 1.37 |
| Facesitting Engages in (Sexual) | 1 | 1.97 | 1.37 |
| Blowjob Engages in (Sexual) | 5 | 0.76 | 1.36 |
| Tomboy Personality | 1 | 1.96 | 1.36 |
| High Heeled Shoes Clothes | 1 | 1.95 | 1.35 |
| Friendly Personality | 2 | 1.22 | 1.34 |
| Sandals Clothes | 1 | 1.93 | 1.34 |
| Airhead Personality | 1 | 1.92 | 1.33 |
| Cravat Clothes | 1 | 1.92 | 1.33 |
| Friend Role | 2 | 1.20 | 1.32 |
| Masturbation in front of an Audience Engages in (Sexual) | 1 | 1.90 | 1.32 |
| Younger Brother Role | 1 | 1.90 | 1.32 |
| Quickie Fix Engages in (Sexual) | 1 | 1.88 | 1.30 |
| Standing Sex Engages in (Sexual) | 1 | 1.87 | 1.29 |
| Twin Braids Hair | 1 | 1.87 | 1.29 |
| Bra Clothes | 1 | 1.85 | 1.28 |
| Doggy Style Subject of (Sexual) | 3 | 0.92 | 1.28 |
| Pink Rotor Subject of (Sexual) | 1 | 1.84 | 1.27 |
| Honest Personality | 1 | 1.83 | 1.27 |
| Lab Coat Clothes | 1 | 1.80 | 1.24 |
| Flirting Engages in | 1 | 1.79 | 1.24 |
| Necktie Clothes | 2 | 1.12 | 1.23 |
| Handjob Subject of (Sexual) | 1 | 1.75 | 1.21 |
| School Uniform Clothes | 4 | 0.75 | 1.21 |
| Short Shorts Clothes | 1 | 1.75 | 1.21 |
| Pajamas Clothes | 1 | 1.75 | 1.21 |
| Skirt Suit Clothes | 1 | 1.74 | 1.21 |
| Missionary Engages in (Sexual) | 1 | 1.74 | 1.21 |
| Teen Body | 6 | 0.62 | 1.21 |
| Mischievous Personality | 1 | 1.72 | 1.19 |
| Footjob Engages in (Sexual) | 1 | 1.72 | 1.19 |
| Cowgirl Engages in (Sexual) | 1 | 1.71 | 1.19 |
| Naive Personality | 1 | 1.69 | 1.17 |
| Mysterious Personality | 1 | 1.69 | 1.17 |
| Miniskirt Clothes | 2 | 1.06 | 1.17 |
| Doggy Style Engages in (Sexual) | 1 | 1.68 | 1.17 |
| Vaginal Masturbation Engages in (Sexual) | 1 | 1.68 | 1.16 |
| Intake Hair | 1 | 1.68 | 1.16 |
| Boots Clothes | 1 | 1.68 | 1.16 |
| Spoons Subject of (Sexual) | 1 | 1.67 | 1.15 |
| Ribbon Hair Accessory Clothes | 1 | 1.66 | 1.15 |
| Relaxed Personality | 1 | 1.64 | 1.13 |
| Mini-dress Clothes | 1 | 1.63 | 1.13 |
| Pervert Personality | 1 | 1.63 | 1.13 |
| Kind Personality | 2 | 1.03 | 1.13 |
| Maid's Headdress Clothes | 1 | 1.62 | 1.13 |
| Slim Body | 6 | 0.58 | 1.12 |
| Pink Eyes | 1 | 1.62 | 1.12 |
| Vaginal Fingering Engages in (Sexual) | 1 | 1.62 | 1.12 |
| Green Eyes | 2 | 1.02 | 1.12 |
| Lactation Engages in | 1 | 1.59 | 1.10 |
| Apron Clothes | 1 | 1.58 | 1.10 |
| Spiky Bangs Hair | 2 | 1.00 | 1.10 |
| Older Sister Role | 1 | 1.56 | 1.08 |
| Jeans Clothes | 1 | 1.55 | 1.08 |
| Sidehair Hair | 2 | 0.98 | 1.07 |
| Hard Worker Personality | 1 | 1.54 | 1.07 |
| Blowjob Subject of (Sexual) | 1 | 1.52 | 1.05 |
| Energetic Personality | 1 | 1.52 | 1.05 |
| Maid's Dress Clothes | 1 | 1.51 | 1.05 |
| Long Hair | 3 | 0.75 | 1.04 |
| Choker Clothes | 1 | 1.50 | 1.04 |
| Green Hair | 1 | 1.48 | 1.02 |
| Pissing Engages in (Sexual) | 1 | 1.47 | 1.02 |
| Blouse Clothes | 1 | 1.46 | 1.01 |
| Headband Clothes | 1 | 1.45 | 1.01 |
| Teasing Engages in | 1 | 1.44 | 1.00 |
| Black Eyes | 1 | 1.42 | 0.98 |
| Cooking Engages in | 1 | 1.42 | 0.98 |
| Jacket Clothes | 1 | 1.42 | 0.98 |
| Not a Virgin Role | 1 | 1.41 | 0.98 |
| Tank Top Clothes | 1 | 1.41 | 0.98 |
| Blond Hair | 2 | 0.89 | 0.98 |
| Pleated Skirt Clothes | 1 | 1.39 | 0.97 |
| Masturbation Engages in (Sexual) | 1 | 1.39 | 0.97 |
| Tsurime Eyes | 1 | 1.38 | 0.96 |
| Hosome Eyes | 1 | 1.37 | 0.95 |
| Wavy Hair | 1 | 1.36 | 0.94 |
| Not Sexually Involved Engages in (Sexual) | 1 | 1.35 | 0.94 |
| Pink Hair | 1 | 1.33 | 0.92 |
| Belt Clothes | 1 | 1.27 | 0.88 |
| Watashi Personality | 1 | 1.25 | 0.87 |
| Dress Clothes | 1 | 1.25 | 0.87 |
| Ribbon Tie Clothes | 1 | 1.25 | 0.87 |
| Short Hair | 3 | 0.61 | 0.84 |
| Blue Hair | 1 | 1.19 | 0.83 |
| Shirt Clothes | 1 | 1.16 | 0.80 |
| Twin Tails Hair | 1 | 1.13 | 0.78 |
| Tareme Eyes | 1 | 1.11 | 0.77 |
| Pale Body | 7 | 0.37 | 0.77 |
| Glasses Clothes | 1 | 1.08 | 0.75 |
| Violet Eyes | 1 | 1.05 | 0.72 |
| Amber Eyes | 1 | 1.03 | 0.71 |
| Waist Length+ Hair | 1 | 0.81 | 0.56 |
| Black Hair | 1 | 0.80 | 0.56 |
| Blue Eyes | 1 | 0.80 | 0.56 |
| Young-adult Body | 1 | 0.76 | 0.53 |
| Brown Hair | 1 | 0.68 | 0.47 |
| 1 | 0.00 | 0.00 |