The protagonist, Hayama Keisuke, is a most average student at a private school. And although they are not related by blood, he has an excellent relationship with his stepmother and sister. Owing to his timid nature, he has not yet dated any girls, but he has an adequate - no, considerable - interest in sex for a boy of his age. Indecent thoughts of his childhood friend - his classmate Yumi - never leave his mind. But then, a single girl turns Keisuke's mundane life on its head. Although change is yet only creeping up on him, it has nevertheless begun. And when Keisuke realizes what is about to happen, his dull life becomes increasingly disturbed day by day. There is no way back. [Translated from the Official website]
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| Name | Characters | Importance | Weight |
|---|---|---|---|
| Anilingus Subject of (Sexual) | 5 | 2.05 | 3.67 |
| Sexual Fantasy Subject of (Sexual) | 4 | 2.22 | 3.57 |
| Intercrural Sex Subject of (Sexual) | 3 | 2.28 | 3.16 |
| Anal Fingering Subject of (Sexual) | 5 | 1.71 | 3.07 |
| Nipple Teasing Subject of (Sexual) | 5 | 1.57 | 2.81 |
| French Kiss Engages in (Sexual) | 5 | 1.48 | 2.65 |
| Nipple Sucking Subject of (Sexual) | 5 | 1.38 | 2.47 |
| Female Ejaculation Engages in (Sexual) | 5 | 1.36 | 2.44 |
| Vaginal Masturbation Engages in (Sexual) | 3 | 1.67 | 2.32 |
| Sex in a Vehicle Engages in (Sexual) | 2 | 2.03 | 2.23 |
| Vaginal Object Insertion Subject of (Sexual) | 2 | 1.99 | 2.19 |
| Panty Gag Subject of (Sexual) | 1 | 3.15 | 2.19 |
| Vibrator Subject of (Sexual) | 2 | 1.97 | 2.16 |
| Swim Cap Clothes | 1 | 3.10 | 2.15 |
| Naizuri Subject of (Sexual) | 1 | 3.10 | 2.15 |
| Piledriver Subject of (Sexual) | 2 | 1.94 | 2.13 |
| Masturbation in front of an Audience Engages in (Sexual) | 2 | 1.90 | 2.09 |
| Cunnilingus Subject of (Sexual) | 5 | 1.16 | 2.08 |
| Pink Rotor Subject of (Sexual) | 2 | 1.84 | 2.02 |
| Hair Ribbon Clothes | 2 | 1.80 | 1.98 |
| Masturbation Engages in (Sexual) | 3 | 1.40 | 1.94 |
| Vaginal Fingering Subject of (Sexual) | 5 | 1.08 | 1.93 |
| Tominagi Subject of (Sexual) | 3 | 1.36 | 1.88 |
| Lotion Play Engages in (Sexual) | 1 | 2.68 | 1.86 |
| Vaginal Fingering Engages in (Sexual) | 2 | 1.61 | 1.77 |
| Sex in Public Places Engages in (Sexual) | 3 | 1.26 | 1.75 |
| Goggles Clothes | 1 | 2.48 | 1.72 |
| Sitting Sex Subject of (Sexual) | 4 | 1.06 | 1.71 |
| Masturbation with Object Engages in (Sexual) | 1 | 2.45 | 1.70 |
| School Swimming Club Member Role | 1 | 2.44 | 1.69 |
| No Panties Clothes | 1 | 2.41 | 1.67 |
| Classic Tsundere Personality | 1 | 2.40 | 1.66 |
| Sex in Front of an Audience Engages in (Sexual) | 2 | 1.50 | 1.65 |
| Anal Sex Subject of (Sexual) | 3 | 1.19 | 1.65 |
| Non-blood-related Mother Role | 1 | 2.37 | 1.64 |
| Dildo Subject of (Sexual) | 1 | 2.37 | 1.64 |
| Student Role | 2 | 1.49 | 1.64 |
| Standing Sex Subject of (Sexual) | 3 | 1.18 | 1.63 |
| Tracksuit Clothes | 1 | 2.32 | 1.61 |
| Handjob Engages in (Sexual) | 3 | 1.16 | 1.60 |
| Nymphomania Subject of | 1 | 2.31 | 1.60 |
| Sexual Fantasy Engages in (Sexual) | 1 | 2.31 | 1.60 |
| Leg Locking During Sex Engages in (Sexual) | 1 | 2.30 | 1.59 |
| Anal Plug Tail Subject of (Sexual) | 1 | 2.29 | 1.59 |
| Swimsuit Clothes | 1 | 2.28 | 1.58 |
| Pissing on Others Engages in (Sexual) | 1 | 2.27 | 1.57 |
| Not a Virgin Role | 2 | 1.41 | 1.55 |
| Food Play Engages in (Sexual) | 1 | 2.23 | 1.55 |
| Public Masturbation Engages in (Sexual) | 1 | 2.21 | 1.53 |
| Widow Role | 1 | 2.20 | 1.53 |
| Seduction Engages in | 1 | 2.17 | 1.51 |
| Non-blood-related Sister Role | 1 | 2.17 | 1.50 |
| Non-blood-related Incest Engages in (Sexual) | 1 | 2.15 | 1.49 |
| Doggy Style Subject of (Sexual) | 4 | 0.92 | 1.49 |
| Voyeurism Engages in (Sexual) | 1 | 2.14 | 1.48 |
| Petplay Subject of (Sexual) | 1 | 2.11 | 1.46 |
| Honor Student Role | 1 | 2.09 | 1.45 |
| Anal Fingering Engages in (Sexual) | 1 | 2.05 | 1.42 |
| Gokkun Engages in (Sexual) | 1 | 2.04 | 1.42 |
| Hime Cut Hair | 1 | 2.02 | 1.40 |
| Nipple Teasing Engages in (Sexual) | 1 | 2.01 | 1.40 |
| Sixty-nine Engages in (Sexual) | 2 | 1.26 | 1.38 |
| Sex with Others Engages in (Sexual) | 1 | 1.99 | 1.38 |
| Blowjob Engages in (Sexual) | 5 | 0.76 | 1.36 |
| Swimming Engages in | 1 | 1.96 | 1.36 |
| Deepthroat Engages in (Sexual) | 1 | 1.80 | 1.25 |
| Nameable Role | 1 | 1.78 | 1.24 |
| Missionary Subject of (Sexual) | 2 | 1.12 | 1.23 |
| Reverse Missionary Subject of (Sexual) | 1 | 1.74 | 1.20 |
| Nipple Sucking Engages in (Sexual) | 1 | 1.70 | 1.18 |
| Boobjob Engages in (Sexual) | 2 | 1.07 | 1.17 |
| Mysterious Personality | 1 | 1.69 | 1.17 |
| Popular Role | 1 | 1.64 | 1.13 |
| Amber Eyes | 2 | 1.03 | 1.13 |
| Pervert Personality | 1 | 1.63 | 1.13 |
| Maid's Headdress Clothes | 1 | 1.63 | 1.13 |
| Pink Eyes | 1 | 1.62 | 1.12 |
| Black Hair | 3 | 0.81 | 1.12 |
| Apron Clothes | 1 | 1.59 | 1.10 |
| Teacher Role | 1 | 1.56 | 1.08 |
| Cunnilingus Engages in (Sexual) | 1 | 1.55 | 1.07 |
| Sex at School Engages in (Sexual) | 1 | 1.55 | 1.07 |
| Hard Worker Personality | 1 | 1.54 | 1.07 |
| School Uniform Clothes | 3 | 0.76 | 1.05 |
| Cowgirl Subject of (Sexual) | 2 | 0.95 | 1.05 |
| Long Hair | 3 | 0.75 | 1.04 |
| Serious Personality | 1 | 1.49 | 1.03 |
| Pissing Engages in (Sexual) | 1 | 1.47 | 1.02 |
| Seventh Posture Subject of (Sexual) | 1 | 1.46 | 1.01 |
| Smart Personality | 1 | 1.46 | 1.01 |
| Mother Role | 1 | 1.46 | 1.01 |
| Cooking Engages in | 1 | 1.42 | 0.98 |
| Pubic Hair Hair | 1 | 1.34 | 0.93 |
| Childhood Friend Role | 1 | 1.26 | 0.87 |
| Teen Body | 3 | 0.62 | 0.86 |
| Classmate Role | 1 | 1.23 | 0.85 |
| Young-adult Body | 2 | 0.76 | 0.83 |
| Butterfly Subject of (Sexual) | 1 | 1.17 | 0.81 |
| Outdoor Sex Engages in (Sexual) | 1 | 1.16 | 0.80 |
| Twin Tails Hair | 1 | 1.13 | 0.78 |
| Brown Hair | 2 | 0.68 | 0.75 |
| Glasses Clothes | 1 | 1.08 | 0.75 |
| Quickie Fix Subject of (Sexual) | 1 | 1.08 | 0.75 |
| Violet Eyes | 1 | 1.05 | 0.73 |
| Kind Personality | 1 | 1.03 | 0.71 |
| High School Student Role | 1 | 0.85 | 0.59 |
| Virgin Sex Engages in (Sexual) | 1 | 0.85 | 0.59 |
| Blue Eyes | 1 | 0.80 | 0.56 |