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 | 3.68 |
| Sexual Fantasy Subject of (Sexual) | 4 | 2.23 | 3.59 |
| Intercrural Sex Subject of (Sexual) | 3 | 2.29 | 3.17 |
| Anal Fingering Subject of (Sexual) | 5 | 1.71 | 3.07 |
| Nipple Teasing Subject of (Sexual) | 5 | 1.59 | 2.85 |
| French Kiss Engages in (Sexual) | 5 | 1.52 | 2.73 |
| Nipple Sucking Subject of (Sexual) | 5 | 1.39 | 2.49 |
| Female Ejaculation Engages in (Sexual) | 5 | 1.38 | 2.47 |
| Vaginal Masturbation Engages in (Sexual) | 3 | 1.77 | 2.45 |
| Vaginal Object Insertion Subject of (Sexual) | 2 | 2.09 | 2.30 |
| Vibrator Subject of (Sexual) | 2 | 2.06 | 2.27 |
| Sex in a Vehicle Engages in (Sexual) | 2 | 2.05 | 2.26 |
| Panty Gag Subject of (Sexual) | 1 | 3.17 | 2.20 |
| Naizuri Subject of (Sexual) | 1 | 3.11 | 2.15 |
| Swim Cap Clothes | 1 | 3.10 | 2.15 |
| Piledriver Subject of (Sexual) | 2 | 1.95 | 2.14 |
| Masturbation in front of an Audience Engages in (Sexual) | 2 | 1.92 | 2.11 |
| Cunnilingus Subject of (Sexual) | 5 | 1.17 | 2.10 |
| Pink Rotor Subject of (Sexual) | 2 | 1.83 | 2.02 |
| Hair Ribbon Clothes | 2 | 1.77 | 1.95 |
| Vaginal Fingering Subject of (Sexual) | 5 | 1.08 | 1.93 |
| Masturbation Engages in (Sexual) | 3 | 1.37 | 1.90 |
| Lotion Play Engages in (Sexual) | 1 | 2.72 | 1.89 |
| Tominagi Subject of (Sexual) | 3 | 1.36 | 1.88 |
| Vaginal Fingering Engages in (Sexual) | 2 | 1.62 | 1.78 |
| 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 | 1.05 | 1.70 |
| School Swimming Club Member Role | 1 | 2.44 | 1.69 |
| Masturbation with Object Engages in (Sexual) | 1 | 2.44 | 1.69 |
| Dildo Subject of (Sexual) | 1 | 2.43 | 1.68 |
| No Panties Clothes | 1 | 2.41 | 1.67 |
| Classic Tsundere Personality | 1 | 2.39 | 1.66 |
| Sex in Front of an Audience Engages in (Sexual) | 2 | 1.51 | 1.66 |
| Non-blood-related Mother Role | 1 | 2.39 | 1.65 |
| Anal Sex Subject of (Sexual) | 3 | 1.19 | 1.65 |
| Standing Sex Subject of (Sexual) | 3 | 1.18 | 1.63 |
| Student Role | 2 | 1.48 | 1.63 |
| Nymphomania Subject of | 1 | 2.34 | 1.62 |
| Leg Locking During Sex Engages in (Sexual) | 1 | 2.34 | 1.62 |
| Sexual Fantasy Engages in (Sexual) | 1 | 2.33 | 1.62 |
| Handjob Engages in (Sexual) | 3 | 1.16 | 1.61 |
| Tracksuit Clothes | 1 | 2.32 | 1.61 |
| Not a Virgin Role | 2 | 1.45 | 1.59 |
| Anal Plug Tail Subject of (Sexual) | 1 | 2.28 | 1.58 |
| Pissing on Others Engages in (Sexual) | 1 | 2.26 | 1.57 |
| Swimsuit Clothes | 1 | 2.25 | 1.56 |
| Sex in School Infirmary Engages in (Sexual) | 1 | 2.24 | 1.55 |
| Food Play Engages in (Sexual) | 1 | 2.22 | 1.54 |
| Public Masturbation Engages in (Sexual) | 1 | 2.22 | 1.54 |
| Widow Role | 1 | 2.22 | 1.54 |
| Seduction Engages in | 1 | 2.20 | 1.52 |
| Voyeurism Engages in (Sexual) | 1 | 2.17 | 1.51 |
| Non-blood-related Incest Engages in (Sexual) | 1 | 2.17 | 1.50 |
| Non-blood-related Sister Role | 1 | 2.17 | 1.50 |
| Doggy Style Subject of (Sexual) | 4 | 0.92 | 1.48 |
| Petplay Subject of (Sexual) | 1 | 2.10 | 1.45 |
| Honor Student Role | 1 | 2.08 | 1.44 |
| Anal Fingering Engages in (Sexual) | 1 | 2.06 | 1.43 |
| Nipple Teasing Engages in (Sexual) | 1 | 2.04 | 1.41 |
| Gokkun Engages in (Sexual) | 1 | 2.03 | 1.41 |
| Hime Cut Hair | 1 | 2.03 | 1.40 |
| Sex with Others Engages in (Sexual) | 1 | 1.99 | 1.38 |
| Sixty-nine Engages in (Sexual) | 2 | 1.25 | 1.38 |
| Swimming Engages in | 1 | 1.97 | 1.37 |
| Blowjob Engages in (Sexual) | 5 | 0.76 | 1.36 |
| Deepthroat Engages in (Sexual) | 1 | 1.81 | 1.26 |
| Nameable Role | 1 | 1.80 | 1.25 |
| Missionary Subject of (Sexual) | 2 | 1.11 | 1.22 |
| Reverse Missionary Subject of (Sexual) | 1 | 1.73 | 1.20 |
| Nipple Sucking Engages in (Sexual) | 1 | 1.71 | 1.19 |
| Mysterious Personality | 1 | 1.69 | 1.17 |
| Boobjob Engages in (Sexual) | 2 | 1.06 | 1.17 |
| Pervert Personality | 1 | 1.65 | 1.14 |
| Popular Role | 1 | 1.64 | 1.13 |
| Maid's Headdress Clothes | 1 | 1.62 | 1.12 |
| Amber Eyes | 2 | 1.02 | 1.12 |
| Black Hair | 3 | 0.81 | 1.12 |
| Pink Eyes | 1 | 1.61 | 1.12 |
| Apron Clothes | 1 | 1.58 | 1.09 |
| Cunnilingus Engages in (Sexual) | 1 | 1.56 | 1.08 |
| Teacher Role | 1 | 1.55 | 1.07 |
| Hard Worker Personality | 1 | 1.54 | 1.07 |
| Cowgirl Subject of (Sexual) | 2 | 0.95 | 1.05 |
| Long Hair | 3 | 0.75 | 1.04 |
| Serious Personality | 1 | 1.50 | 1.04 |
| School Uniform Clothes | 3 | 0.74 | 1.02 |
| Mother Role | 1 | 1.47 | 1.02 |
| Smart Personality | 1 | 1.47 | 1.02 |
| Pissing Engages in (Sexual) | 1 | 1.46 | 1.01 |
| Seventh Posture Subject of (Sexual) | 1 | 1.45 | 1.01 |
| Cooking Engages in | 1 | 1.41 | 0.98 |
| Pubic Hair Hair | 1 | 1.34 | 0.93 |
| Childhood Friend Role | 1 | 1.25 | 0.87 |
| Classmate Role | 1 | 1.23 | 0.85 |
| Teen Body | 3 | 0.61 | 0.85 |
| Young-adult Body | 2 | 0.77 | 0.85 |
| Butterfly Subject of (Sexual) | 1 | 1.17 | 0.81 |
| Outdoor Sex Engages in (Sexual) | 1 | 1.16 | 0.80 |
| Twin Tails Hair | 1 | 1.12 | 0.78 |
| Glasses Clothes | 1 | 1.08 | 0.75 |
| Brown Hair | 2 | 0.68 | 0.75 |
| Quickie Fix Subject of (Sexual) | 1 | 1.08 | 0.75 |
| Kind Personality | 1 | 1.04 | 0.72 |
| Violet Eyes | 1 | 1.04 | 0.72 |
| Virgin Sex Engages in (Sexual) | 1 | 0.84 | 0.58 |
| High School Student Role | 1 | 0.84 | 0.58 |
| Blue Eyes | 1 | 0.80 | 0.55 |