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 | 2.18 | 3.03 |
| Third Person Personality | 3 | 2.11 | 2.93 |
| Triple Blowjob Engages in (Sexual) | 3 | 2.10 | 2.91 |
| Gokkun Engages in (Sexual) | 3 | 2.04 | 2.83 |
| Sleep Sex Subject of (Sexual) | 2 | 2.49 | 2.74 |
| Wake-up Sex Subject of (Sexual) | 2 | 2.48 | 2.73 |
| Bellyjob Subject of (Sexual) | 1 | 3.82 | 2.65 |
| Unenthusiastic Sex Subject of (Sexual) | 1 | 3.74 | 2.59 |
| Pink Rotor Subject of (Sexual) | 3 | 1.84 | 2.55 |
| Crotchless One Piece Micro Bikini Clothes | 1 | 3.60 | 2.49 |
| Balls Sucking Engages in (Sexual) | 2 | 2.25 | 2.48 |
| Triple Boobjob Subject of (Sexual) | 1 | 3.41 | 2.36 |
| Incest Engages in (Sexual) | 4 | 1.47 | 2.36 |
| Bellyjob Engages in (Sexual) | 1 | 3.27 | 2.27 |
| Vaginal Fingering Engages in (Sexual) | 3 | 1.61 | 2.24 |
| Bathroom Sex Engages in (Sexual) | 4 | 1.39 | 2.23 |
| Nipple Teasing Subject of (Sexual) | 3 | 1.57 | 2.18 |
| Full Sister Role | 3 | 1.56 | 2.17 |
| Cunnilingus Engages in (Sexual) | 3 | 1.55 | 2.15 |
| Bisexual Role | 2 | 1.94 | 2.13 |
| Sex in Front of an Audience Engages in (Sexual) | 3 | 1.50 | 2.08 |
| Triple Blowjob Subject of (Sexual) | 1 | 2.97 | 2.06 |
| French Kiss Engages in (Sexual) | 3 | 1.48 | 2.05 |
| Sailor School Uniform Clothes | 3 | 1.48 | 2.05 |
| Younger Sister Role | 3 | 1.44 | 2.00 |
| Deepthroat Engages in (Sexual) | 2 | 1.80 | 1.98 |
| Pleated Skirt Clothes | 3 | 1.39 | 1.93 |
| Sleep Sex Engages in (Sexual) | 1 | 2.76 | 1.92 |
| Knee-high Socks Clothes | 3 | 1.38 | 1.91 |
| Lesbian Sex Engages in (Sexual) | 3 | 1.38 | 1.91 |
| Female Ejaculation Engages in (Sexual) | 3 | 1.36 | 1.89 |
| Group Sex of One Male and Several Females Engages in (Sexual) | 4 | 1.17 | 1.89 |
| Off-The-Shoulder Sweater Clothes | 1 | 2.71 | 1.88 |
| Tominagi Subject of (Sexual) | 3 | 1.36 | 1.88 |
| Bukkake Subject of (Sexual) | 3 | 1.35 | 1.87 |
| Balls Sucking Subject of (Sexual) | 1 | 2.67 | 1.85 |
| Spoons Subject of (Sexual) | 2 | 1.67 | 1.83 |
| Sixty-nine Engages in (Sexual) | 3 | 1.26 | 1.74 |
| Band-aid Clothes | 1 | 2.51 | 1.74 |
| Sex in Water Engages in (Sexual) | 2 | 1.56 | 1.72 |
| Masturbation with Object Engages in (Sexual) | 1 | 2.45 | 1.69 |
| Half Updo Hair | 1 | 2.44 | 1.69 |
| Anal Sex Subject of (Sexual) | 3 | 1.19 | 1.65 |
| Sister Complex Personality | 1 | 2.38 | 1.65 |
| Anal Gaping Engages in (Sexual) | 1 | 2.37 | 1.64 |
| Wake-up Sex Engages in (Sexual) | 1 | 2.36 | 1.63 |
| Deepthroat Subject of (Sexual) | 1 | 2.35 | 1.63 |
| Facesitting Subject of (Sexual) | 1 | 2.35 | 1.63 |
| Cunnilingus Subject of (Sexual) | 3 | 1.16 | 1.61 |
| Twin Blowjob Subject of (Sexual) | 1 | 2.31 | 1.60 |
| Smart Personality | 2 | 1.46 | 1.60 |
| Twin Blowjob Engages in (Sexual) | 2 | 1.45 | 1.59 |
| Intercrural Sex Subject of (Sexual) | 1 | 2.28 | 1.58 |
| Pissing on Others Engages in (Sexual) | 1 | 2.27 | 1.57 |
| Big Breasts Body | 3 | 1.13 | 1.57 |
| Reverse Cowgirl Engages in (Sexual) | 1 | 2.22 | 1.54 |
| Spoons Engages in (Sexual) | 1 | 2.21 | 1.53 |
| Inbreeding Engages in (Sexual) | 1 | 2.20 | 1.53 |
| Seventh Posture Engages in (Sexual) | 1 | 2.19 | 1.52 |
| Vaginal Fingering Subject of (Sexual) | 3 | 1.08 | 1.50 |
| Boobjob Engages in (Sexual) | 3 | 1.07 | 1.48 |
| Sitting Sex Subject of (Sexual) | 3 | 1.06 | 1.47 |
| Flustered Personality | 1 | 2.12 | 1.47 |
| Tominagi Engages in (Sexual) | 1 | 2.11 | 1.46 |
| Insightful Personality | 1 | 2.10 | 1.45 |
| Brother Complex Personality | 1 | 2.06 | 1.43 |
| Anal Fingering Engages in (Sexual) | 1 | 2.05 | 1.42 |
| Uniform Clothes | 1 | 2.02 | 1.40 |
| Butterfly Engages in (Sexual) | 1 | 2.02 | 1.40 |
| Nipple Teasing Engages in (Sexual) | 1 | 2.01 | 1.39 |
| Vaginal Object Insertion Subject of (Sexual) | 1 | 2.00 | 1.39 |
| Facesitting Engages in (Sexual) | 1 | 1.97 | 1.37 |
| Full Brother Role | 1 | 1.95 | 1.35 |
| Vaginal Gaping Engages in (Sexual) | 1 | 1.95 | 1.35 |
| Amnesia Subject of | 1 | 1.95 | 1.35 |
| Airhead Personality | 1 | 1.92 | 1.33 |
| Masturbation in front of an Audience Engages in (Sexual) | 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 |
| Standing Sex Subject of (Sexual) | 2 | 1.18 | 1.29 |
| Boobjob Subject of (Sexual) | 1 | 1.86 | 1.29 |
| Intercrural Sex Engages in (Sexual) | 1 | 1.84 | 1.28 |
| Handjob Engages in (Sexual) | 2 | 1.16 | 1.27 |
| Sitting Sex Engages in (Sexual) | 1 | 1.82 | 1.26 |
| String Ribbon Tie Clothes | 1 | 1.82 | 1.26 |
| Twin Tails Hair | 2 | 1.13 | 1.24 |
| Nameable Role | 1 | 1.78 | 1.24 |
| Scarf Clothes | 1 | 1.78 | 1.23 |
| Missionary Subject of (Sexual) | 2 | 1.12 | 1.23 |
| Anal Sex Engages in (Sexual) | 1 | 1.76 | 1.22 |
| Handjob Subject of (Sexual) | 1 | 1.75 | 1.21 |
| Missionary Engages in (Sexual) | 1 | 1.74 | 1.21 |
| Cheerful Personality | 1 | 1.74 | 1.20 |
| Older Brother Role | 1 | 1.73 | 1.20 |
| Quickie Fix Subject of (Sexual) | 2 | 1.08 | 1.19 |
| Anal Fingering Subject of (Sexual) | 1 | 1.71 | 1.19 |
| High School Student Role | 3 | 0.85 | 1.18 |
| Virgin Sex Engages in (Sexual) | 3 | 0.85 | 1.18 |
| Nipple Sucking Engages in (Sexual) | 1 | 1.70 | 1.18 |
| Naive Personality | 1 | 1.69 | 1.17 |
| Doggy Style Engages in (Sexual) | 1 | 1.68 | 1.17 |
| Vaginal Masturbation Engages in (Sexual) | 1 | 1.68 | 1.16 |
| Sex with Protagonist Only Engages in (Sexual) | 1 | 1.68 | 1.16 |
| Cyan Eyes | 1 | 1.66 | 1.15 |
| Relaxed Personality | 1 | 1.64 | 1.13 |
| Reverse Cowgirl Subject of (Sexual) | 1 | 1.63 | 1.13 |
| Pervert Personality | 1 | 1.63 | 1.13 |
| Kind Personality | 2 | 1.03 | 1.13 |
| Waist Length+ Hair | 3 | 0.81 | 1.12 |
| Pink Eyes | 1 | 1.62 | 1.12 |
| University Student Role | 1 | 1.59 | 1.10 |
| Spiky Bangs Hair | 2 | 1.00 | 1.10 |
| Sidehair Hair | 2 | 0.98 | 1.07 |
| Vest Clothes | 1 | 1.52 | 1.06 |
| Blowjob Engages in (Sexual) | 3 | 0.76 | 1.06 |
| Blowjob Subject of (Sexual) | 1 | 1.52 | 1.05 |
| Cowgirl Subject of (Sexual) | 2 | 0.95 | 1.05 |
| Choker Clothes | 1 | 1.50 | 1.04 |
| Pissing Engages in (Sexual) | 1 | 1.47 | 1.02 |
| Doggy Style Subject of (Sexual) | 2 | 0.92 | 1.02 |
| Blouse Clothes | 1 | 1.46 | 1.01 |
| Seventh Posture Subject of (Sexual) | 1 | 1.46 | 1.01 |
| V Bangs Hair | 1 | 1.41 | 0.98 |
| Tank Top Clothes | 1 | 1.41 | 0.98 |
| Hairpin Clothes | 1 | 1.40 | 0.97 |
| Tsurime Eyes | 1 | 1.38 | 0.96 |
| Nipple Sucking Subject of (Sexual) | 1 | 1.38 | 0.96 |
| Slim Body | 4 | 0.58 | 0.93 |
| Skirt Clothes | 1 | 1.34 | 0.93 |
| Watashi Personality | 1 | 1.25 | 0.87 |
| Teen Body | 3 | 0.62 | 0.86 |
| Ribbon Hair Tie Clothes | 1 | 1.19 | 0.83 |
| Butterfly Subject of (Sexual) | 1 | 1.17 | 0.81 |
| Brown Hair | 2 | 0.68 | 0.75 |
| Miniskirt Clothes | 1 | 1.06 | 0.74 |
| Amber Eyes | 1 | 1.03 | 0.71 |
| Pale Body | 4 | 0.37 | 0.59 |
| Black Hair | 1 | 0.80 | 0.56 |
| Young-adult Body | 1 | 0.76 | 0.53 |