The summer of Japan is the summer of breasts!? This is a comical story where a boyish girl and a huge-breasted woman who is expected to be a worldwide scientist in the future! They fight over the protagonist, who happens to love big breasts above all! Worried about her breast size, the girl decides to make her bust larger so that she can protect her beloved boy from the seduction of the scientist and make him her boyfriend! [From DLsite English]
Poyopoyo Oppai Summer has not appeared in our Steam sample enough to calculate it's similar novels... sorry!
A novel needs atleast 20 owners before it's similarity is calculated.
| Name | Characters | Importance | Weight |
|---|---|---|---|
| Twin Bellyjob Engages in (Sexual) | 2 | 3.20 | 3.51 |
| Mitre Clothes | 1 | 3.34 | 2.31 |
| Lace Lingerie Clothes | 2 | 2.09 | 2.30 |
| Tribadism on Penis Engages in (Sexual) | 2 | 2.08 | 2.29 |
| Platform Shoes Clothes | 1 | 2.94 | 2.04 |
| Reverse Spitroast Subject of (Sexual) | 2 | 1.84 | 2.02 |
| Twin Boobjob Engages in (Sexual) | 2 | 1.77 | 1.94 |
| Adult Breast Sucking Subject of (Sexual) | 1 | 2.66 | 1.84 |
| Shorts Clothes | 2 | 1.68 | 1.84 |
| Intake Hair | 2 | 1.67 | 1.84 |
| Breast Smothering Engages in (Sexual) | 1 | 2.64 | 1.83 |
| Hair Beads Hair | 1 | 2.52 | 1.75 |
| Nipple Insertion Subject of (Sexual) | 1 | 2.45 | 1.69 |
| Pregnant Sex Engages in (Sexual) | 2 | 1.53 | 1.68 |
| Shawl Clothes | 1 | 2.41 | 1.67 |
| Mirror Sex Engages in (Sexual) | 1 | 2.31 | 1.60 |
| Handbag Items | 1 | 2.29 | 1.59 |
| Twin Blowjob Engages in (Sexual) | 2 | 1.45 | 1.59 |
| Scientist Role | 1 | 2.28 | 1.58 |
| Blowjob Duck Face Engages in (Sexual) | 1 | 2.24 | 1.55 |
| Micro Bikini Clothes | 1 | 2.21 | 1.53 |
| Torn Pantyhose (damaged) Clothes | 1 | 2.21 | 1.53 |
| Robot Role | 1 | 2.20 | 1.53 |
| Spats Clothes | 1 | 2.20 | 1.52 |
| Nipple Sucking Subject of (Sexual) | 2 | 1.38 | 1.52 |
| Torn Clothing Clothes | 1 | 2.16 | 1.50 |
| Shimapan Clothes | 1 | 2.13 | 1.48 |
| Old Type School Swimsuit Clothes | 1 | 2.09 | 1.45 |
| Ahoge Hair | 2 | 1.32 | 1.45 |
| Wristband Clothes | 1 | 2.00 | 1.39 |
| Facesitting Engages in (Sexual) | 1 | 1.97 | 1.37 |
| Tomboy Personality | 1 | 1.96 | 1.36 |
| Vaginal Gaping Engages in (Sexual) | 1 | 1.95 | 1.35 |
| Sandals Clothes | 1 | 1.94 | 1.34 |
| Fang Body | 1 | 1.88 | 1.30 |
| Standing Sex Subject of (Sexual) | 2 | 1.18 | 1.29 |
| Short (obsolete) Body | 1 | 1.86 | 1.29 |
| Outdoor Sex Engages in (Sexual) | 2 | 1.16 | 1.27 |
| String Ribbon Tie Clothes | 1 | 1.82 | 1.26 |
| Deepthroat Engages in (Sexual) | 1 | 1.80 | 1.25 |
| Lab Coat Clothes | 1 | 1.80 | 1.25 |
| Braid Hair | 1 | 1.78 | 1.24 |
| Sports Shoes Clothes | 1 | 1.72 | 1.20 |
| Cape Clothes | 1 | 1.71 | 1.19 |
| Hoodie Clothes | 1 | 1.71 | 1.18 |
| Boobjob Engages in (Sexual) | 2 | 1.07 | 1.17 |
| Parted to Side Hair | 2 | 1.05 | 1.16 |
| Cyan Eyes | 1 | 1.66 | 1.15 |
| Teasing Subject of | 1 | 1.66 | 1.15 |
| Sweater Clothes | 1 | 1.64 | 1.14 |
| Sex in Water Engages in (Sexual) | 1 | 1.56 | 1.08 |
| Teacher Role | 1 | 1.55 | 1.08 |
| Big Breast Sizes Body | 1 | 1.54 | 1.07 |
| Medium Breasts Body | 1 | 1.52 | 1.05 |
| Cowgirl Subject of (Sexual) | 2 | 0.95 | 1.05 |
| Group Sex Engages in (Sexual) | 1 | 1.50 | 1.04 |
| Student Role | 1 | 1.49 | 1.03 |
| Sailor School Uniform Clothes | 1 | 1.48 | 1.03 |
| Blouse Clothes | 1 | 1.47 | 1.02 |
| Pissing Engages in (Sexual) | 1 | 1.46 | 1.02 |
| Headband Clothes | 1 | 1.45 | 1.00 |
| Pantyhose Clothes | 1 | 1.42 | 0.99 |
| Tank Top Clothes | 1 | 1.42 | 0.98 |
| Hairpin Clothes | 1 | 1.40 | 0.97 |
| Bathroom Sex Engages in (Sexual) | 1 | 1.39 | 0.96 |
| Kid Body | 1 | 1.37 | 0.95 |
| Virgin Sex Engages in (Sexual) | 2 | 0.85 | 0.93 |
| Skirt Clothes | 1 | 1.33 | 0.93 |
| White Hair | 1 | 1.33 | 0.92 |
| Pink Hair | 1 | 1.33 | 0.92 |
| Ahegao Engages in (Sexual) | 1 | 1.32 | 0.92 |
| T-shirt Clothes | 1 | 1.31 | 0.91 |
| Belt Clothes | 1 | 1.27 | 0.88 |
| Sex in Public Places Engages in (Sexual) | 1 | 1.26 | 0.87 |
| Sixty-nine Engages in (Sexual) | 1 | 1.26 | 0.87 |
| Childhood Friend Role | 1 | 1.26 | 0.87 |
| Blowjob Engages in (Sexual) | 2 | 0.76 | 0.84 |
| Anal Sex Subject of (Sexual) | 1 | 1.19 | 0.82 |
| Butterfly Subject of (Sexual) | 1 | 1.17 | 0.81 |
| Handjob Engages in (Sexual) | 1 | 1.16 | 0.80 |
| Missionary Subject of (Sexual) | 1 | 1.12 | 0.77 |
| Glasses Clothes | 1 | 1.08 | 0.75 |
| Quickie Fix Subject of (Sexual) | 1 | 1.08 | 0.75 |
| Sitting Sex Subject of (Sexual) | 1 | 1.06 | 0.74 |
| Violet Eyes | 1 | 1.04 | 0.72 |
| Thigh-high Stockings Clothes | 1 | 1.04 | 0.72 |
| Sidehair Hair | 1 | 0.98 | 0.68 |
| Doggy Style Subject of (Sexual) | 1 | 0.93 | 0.64 |
| Blond Hair | 1 | 0.89 | 0.62 |
| Waist Length+ Hair | 1 | 0.81 | 0.56 |
| Blue Eyes | 1 | 0.80 | 0.56 |
| Young-adult Body | 1 | 0.76 | 0.53 |
| Long Hair | 1 | 0.75 | 0.52 |
| School Uniform Clothes | 1 | 0.75 | 0.52 |
| Teen Body | 1 | 0.62 | 0.43 |
| Short Hair | 1 | 0.61 | 0.42 |