The protagonist, Tonomiya Masashi, wakes up one morning and realizes that he has completely lost his memories. He doesn't even recognize his own name. As he explores an unfamiliar house, he learns that he has three younger sisters, and they all live together in the house while their parents are currently traveling overseas. The story revolves around Masashi struggling with his newfound situation of living under the same roof with three unknown high school girls, as well as dealing with the sibling relationships. Will he be able to keep his cool around them? Will his memory ever come back? Only time will tell.
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| Name | Characters | Importance | Weight |
|---|---|---|---|
| Triple Boobjob Engages in (Sexual) | 3 | 2.51 | 3.48 |
| Anal Object Insertion Subject of (Sexual) | 3 | 2.29 | 3.17 |
| Third Person Personality | 3 | 2.11 | 2.93 |
| Triple Blowjob Engages in (Sexual) | 3 | 2.08 | 2.89 |
| Gokkun Engages in (Sexual) | 3 | 2.03 | 2.81 |
| Sleep Sex Subject of (Sexual) | 2 | 2.51 | 2.75 |
| Wake-up Sex Subject of (Sexual) | 2 | 2.50 | 2.74 |
| Bellyjob Subject of (Sexual) | 1 | 3.77 | 2.62 |
| Unenthusiastic Sex Subject of (Sexual) | 1 | 3.73 | 2.59 |
| Pink Rotor Subject of (Sexual) | 3 | 1.83 | 2.54 |
| Balls Sucking Engages in (Sexual) | 2 | 2.27 | 2.50 |
| Crotchless One Piece Micro Bikini Clothes | 1 | 3.58 | 2.48 |
| Triple Boobjob Subject of (Sexual) | 1 | 3.45 | 2.39 |
| Incest Engages in (Sexual) | 4 | 1.47 | 2.37 |
| Bellyjob Engages in (Sexual) | 1 | 3.26 | 2.26 |
| Vaginal Fingering Engages in (Sexual) | 3 | 1.62 | 2.25 |
| Bathroom Sex Engages in (Sexual) | 4 | 1.39 | 2.24 |
| Nipple Teasing Subject of (Sexual) | 3 | 1.59 | 2.21 |
| Bisexual Role | 2 | 1.99 | 2.19 |
| Full Sister Role | 3 | 1.57 | 2.18 |
| Cunnilingus Engages in (Sexual) | 3 | 1.56 | 2.17 |
| French Kiss Engages in (Sexual) | 3 | 1.52 | 2.11 |
| Sex in Front of an Audience Engages in (Sexual) | 3 | 1.51 | 2.09 |
| Triple Blowjob Subject of (Sexual) | 1 | 2.99 | 2.07 |
| Sailor School Uniform Clothes | 3 | 1.48 | 2.06 |
| Younger Sister Role | 3 | 1.44 | 2.00 |
| Deepthroat Engages in (Sexual) | 2 | 1.81 | 1.99 |
| Pleated Skirt Clothes | 3 | 1.41 | 1.96 |
| Sleep Sex Engages in (Sexual) | 1 | 2.79 | 1.94 |
| Group Sex of One Male and Several Females Engages in (Sexual) | 4 | 1.19 | 1.92 |
| Lesbian Sex Engages in (Sexual) | 3 | 1.38 | 1.92 |
| Female Ejaculation Engages in (Sexual) | 3 | 1.38 | 1.91 |
| Knee-high Socks Clothes | 3 | 1.37 | 1.90 |
| Off-The-Shoulder Sweater Clothes | 1 | 2.73 | 1.90 |
| Tominagi Subject of (Sexual) | 3 | 1.36 | 1.88 |
| Balls Sucking Subject of (Sexual) | 1 | 2.69 | 1.87 |
| Bukkake Subject of (Sexual) | 3 | 1.34 | 1.86 |
| Spoons Subject of (Sexual) | 2 | 1.67 | 1.83 |
| Half Updo Hair | 1 | 2.52 | 1.74 |
| Band-aid Clothes | 1 | 2.51 | 1.74 |
| Sixty-nine Engages in (Sexual) | 3 | 1.25 | 1.74 |
| Sex in Water Engages in (Sexual) | 2 | 1.56 | 1.71 |
| Masturbation with Object Engages in (Sexual) | 1 | 2.44 | 1.69 |
| Anal Gaping Engages in (Sexual) | 1 | 2.40 | 1.66 |
| Wake-up Sex Engages in (Sexual) | 1 | 2.38 | 1.65 |
| Sister Complex Personality | 1 | 2.38 | 1.65 |
| Anal Sex Subject of (Sexual) | 3 | 1.19 | 1.65 |
| Big Breasts Body | 3 | 1.19 | 1.64 |
| Facesitting Subject of (Sexual) | 1 | 2.37 | 1.64 |
| Deepthroat Subject of (Sexual) | 1 | 2.36 | 1.64 |
| Cunnilingus Subject of (Sexual) | 3 | 1.17 | 1.62 |
| Twin Blowjob Subject of (Sexual) | 1 | 2.33 | 1.62 |
| Smart Personality | 2 | 1.47 | 1.61 |
| Intercrural Sex Subject of (Sexual) | 1 | 2.29 | 1.59 |
| Twin Blowjob Engages in (Sexual) | 2 | 1.44 | 1.58 |
| Pissing on Others Engages in (Sexual) | 1 | 2.26 | 1.57 |
| Reverse Cowgirl Engages in (Sexual) | 1 | 2.24 | 1.56 |
| Spoons Engages in (Sexual) | 1 | 2.23 | 1.55 |
| Inbreeding Engages in (Sexual) | 1 | 2.22 | 1.54 |
| Seventh Posture Engages in (Sexual) | 1 | 2.20 | 1.52 |
| Vaginal Fingering Subject of (Sexual) | 3 | 1.08 | 1.49 |
| Flustered Personality | 1 | 2.14 | 1.49 |
| Tominagi Engages in (Sexual) | 1 | 2.14 | 1.48 |
| Boobjob Engages in (Sexual) | 3 | 1.06 | 1.47 |
| Insightful Personality | 1 | 2.11 | 1.47 |
| Sitting Sex Subject of (Sexual) | 3 | 1.05 | 1.46 |
| Vaginal Object Insertion Subject of (Sexual) | 1 | 2.09 | 1.45 |
| Anal Fingering Engages in (Sexual) | 1 | 2.06 | 1.43 |
| Brother Complex Personality | 1 | 2.06 | 1.43 |
| Butterfly Engages in (Sexual) | 1 | 2.04 | 1.41 |
| Nipple Teasing Engages in (Sexual) | 1 | 2.04 | 1.41 |
| Uniform Clothes | 1 | 2.01 | 1.39 |
| Facesitting Engages in (Sexual) | 1 | 2.00 | 1.38 |
| Vaginal Gaping Engages in (Sexual) | 1 | 1.96 | 1.36 |
| Amnesia Subject of | 1 | 1.95 | 1.35 |
| Full Brother Role | 1 | 1.95 | 1.35 |
| Masturbation in front of an Audience Engages in (Sexual) | 1 | 1.92 | 1.33 |
| Airhead Personality | 1 | 1.91 | 1.33 |
| Quickie Fix Engages in (Sexual) | 1 | 1.89 | 1.31 |
| Standing Sex Engages in (Sexual) | 1 | 1.88 | 1.31 |
| Boobjob Subject of (Sexual) | 1 | 1.87 | 1.30 |
| Standing Sex Subject of (Sexual) | 2 | 1.18 | 1.29 |
| Intercrural Sex Engages in (Sexual) | 1 | 1.85 | 1.28 |
| Handjob Engages in (Sexual) | 2 | 1.16 | 1.27 |
| Sitting Sex Engages in (Sexual) | 1 | 1.83 | 1.27 |
| String Ribbon Tie Clothes | 1 | 1.81 | 1.26 |
| Nameable Role | 1 | 1.80 | 1.25 |
| Cheerful Personality | 1 | 1.78 | 1.23 |
| Twin Tails Hair | 2 | 1.12 | 1.23 |
| Scarf Clothes | 1 | 1.77 | 1.23 |
| Vaginal Masturbation Engages in (Sexual) | 1 | 1.77 | 1.23 |
| Anal Sex Engages in (Sexual) | 1 | 1.77 | 1.23 |
| Missionary Subject of (Sexual) | 2 | 1.11 | 1.22 |
| Handjob Subject of (Sexual) | 1 | 1.76 | 1.22 |
| Missionary Engages in (Sexual) | 1 | 1.75 | 1.21 |
| Older Brother Role | 1 | 1.72 | 1.20 |
| Nipple Sucking Engages in (Sexual) | 1 | 1.71 | 1.19 |
| Anal Fingering Subject of (Sexual) | 1 | 1.71 | 1.19 |
| Naive Personality | 1 | 1.71 | 1.18 |
| Quickie Fix Subject of (Sexual) | 2 | 1.08 | 1.18 |
| Doggy Style Engages in (Sexual) | 1 | 1.70 | 1.18 |
| Sex with Protagonist Only Engages in (Sexual) | 1 | 1.69 | 1.17 |
| Virgin Sex Engages in (Sexual) | 3 | 0.84 | 1.17 |
| High School Student Role | 3 | 0.84 | 1.16 |
| Cyan Eyes | 1 | 1.67 | 1.16 |
| Pervert Personality | 1 | 1.65 | 1.14 |
| Kind Personality | 2 | 1.04 | 1.14 |
| Relaxed Personality | 1 | 1.64 | 1.14 |
| Reverse Cowgirl Subject of (Sexual) | 1 | 1.64 | 1.14 |
| University Student Role | 1 | 1.62 | 1.12 |
| Pink Eyes | 1 | 1.61 | 1.12 |
| Spiky Bangs Hair | 2 | 1.01 | 1.11 |
| Waist Length+ Hair | 3 | 0.80 | 1.11 |
| Sidehair Hair | 2 | 0.98 | 1.07 |
| Blowjob Subject of (Sexual) | 1 | 1.53 | 1.06 |
| Vest Clothes | 1 | 1.53 | 1.06 |
| Blowjob Engages in (Sexual) | 3 | 0.76 | 1.05 |
| Choker Clothes | 1 | 1.51 | 1.05 |
| Cowgirl Subject of (Sexual) | 2 | 0.95 | 1.05 |
| Blouse Clothes | 1 | 1.48 | 1.03 |
| Doggy Style Subject of (Sexual) | 2 | 0.92 | 1.01 |
| Pissing Engages in (Sexual) | 1 | 1.46 | 1.01 |
| Seventh Posture Subject of (Sexual) | 1 | 1.45 | 1.01 |
| Tank Top Clothes | 1 | 1.43 | 0.99 |
| V Bangs Hair | 1 | 1.42 | 0.98 |
| Hairpin Clothes | 1 | 1.39 | 0.97 |
| Nipple Sucking Subject of (Sexual) | 1 | 1.39 | 0.96 |
| Tsurime Eyes | 1 | 1.38 | 0.95 |
| Skirt Clothes | 1 | 1.33 | 0.92 |
| Slim Body | 4 | 0.57 | 0.92 |
| Watashi Personality | 1 | 1.26 | 0.88 |
| Teen Body | 3 | 0.61 | 0.85 |
| Ribbon Hair Tie Clothes | 1 | 1.18 | 0.82 |
| Butterfly Subject of (Sexual) | 1 | 1.17 | 0.81 |
| Brown Hair | 2 | 0.68 | 0.75 |
| Miniskirt Clothes | 1 | 1.07 | 0.74 |
| Amber Eyes | 1 | 1.02 | 0.71 |
| Pale Body | 4 | 0.37 | 0.60 |
| Black Hair | 1 | 0.81 | 0.56 |
| Young-adult Body | 1 | 0.77 | 0.53 |