The protagonist, Makoto Sakurai, is a high school student. One day, his new neighbour, Atsushi Uchiyama, tells him an shocking secret about his family: he has a secret sexual relationship with his own mother. For him, it's completely normal. But ever since, Makoto's way of looking at his mother, and at his friends, has changed. Then, one day, Makoto's father has to leave for an extended business trip, leaving Makoto alone with his mother. Makoto feels something vaguely unsettling, and his concerns turn out to be a reality. That day, when he comes back from school, his mother is waiting for him completely naked, ready to start an incestuous relationship with her son. And it looks like his friends are in a similar situation!
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| Name | Score | Importance | Weight |
|---|---|---|---|
| Open Relationship | 3.00 | 2.86 | 8.59 |
| Protagonist's Non-blood-related Mother as a Heroine | 2.50 | 2.17 | 5.42 |
| Shota Protagonist | 2.50 | 1.84 | 4.61 |
| Straight Shotacon | 2.50 | 1.79 | 4.48 |
| Blowbang | 2.00 | 2.22 | 4.45 |
| Netorase | 2.00 | 2.21 | 4.42 |
| Blood-related Mother/Son Incest | 2.33 | 1.84 | 4.30 |
| Mother Support Character | 2.33 | 1.77 | 4.12 |
| Heroine with Children | 2.00 | 1.90 | 3.79 |
| Heroine Having Sex with Others | 2.50 | 1.51 | 3.78 |
| Wake-up Sex | 2.00 | 1.81 | 3.61 |
| Reverse Netorase | 1.00 | 3.36 | 3.36 |
| Modern Day | 2.00 | 1.58 | 3.16 |
| Adult Heroine | 2.67 | 1.13 | 3.02 |
| Modern Day Japan | 2.00 | 1.33 | 2.66 |
| Swinging | 1.00 | 2.56 | 2.56 |
| Shotacon | 1.25 | 2.01 | 2.52 |
| Heroine with Sexual Experience | 2.00 | 1.21 | 2.42 |
| Protagonist with a Face | 2.00 | 0.63 | 1.26 |
| ADV | 2.00 | 0.15 | 0.29 |
| Name | Characters | Importance | Weight |
|---|---|---|---|
| Consensual Group Sex of One Female and Several Males Engages in (Sexual) | 6 | 2.44 | 4.75 |
| Group Sex of Multiple Females and Males Engages in (Sexual) | 6 | 1.90 | 3.70 |
| Blowbang Subject of (Sexual) | 2 | 3.30 | 3.62 |
| Sex with Children Engages in (Sexual) | 3 | 2.48 | 3.44 |
| Incest Engages in (Sexual) | 6 | 1.47 | 2.86 |
| Wedding Ring Clothes | 3 | 2.00 | 2.78 |
| Single Parent Role | 2 | 2.48 | 2.73 |
| Spit-roast Engages in (Sexual) | 2 | 2.44 | 2.68 |
| Facesitting Subject of (Sexual) | 2 | 2.34 | 2.57 |
| Breast Smothering Subject of (Sexual) | 1 | 3.60 | 2.49 |
| Handjob Subject of (Sexual) | 3 | 1.75 | 2.42 |
| Missionary Engages in (Sexual) | 3 | 1.74 | 2.41 |
| Mother Role | 4 | 1.45 | 2.34 |
| Nipple Sucking Engages in (Sexual) | 3 | 1.69 | 2.34 |
| Doggy Style Engages in (Sexual) | 3 | 1.68 | 2.33 |
| Pharmacist Role | 1 | 3.34 | 2.31 |
| Rimming Handjob Subject of (Sexual) | 1 | 3.21 | 2.22 |
| Butterfly Engages in (Sexual) | 2 | 2.02 | 2.22 |
| Neighbor Role | 2 | 2.00 | 2.19 |
| Sex in Water Engages in (Sexual) | 3 | 1.56 | 2.17 |
| Vaginal Gaping Engages in (Sexual) | 2 | 1.95 | 2.14 |
| Energetic Personality | 3 | 1.52 | 2.11 |
| Blowjob Subject of (Sexual) | 3 | 1.52 | 2.11 |
| Quickie Fix Engages in (Sexual) | 2 | 1.88 | 2.07 |
| Honest Personality | 2 | 1.83 | 2.01 |
| Nursing Handjob Subject of (Sexual) | 1 | 2.87 | 1.99 |
| Son Role | 2 | 1.81 | 1.99 |
| Bathroom Sex Engages in (Sexual) | 3 | 1.38 | 1.92 |
| Kid Body | 3 | 1.38 | 1.91 |
| Reverse Missionary Subject of (Sexual) | 2 | 1.74 | 1.91 |
| Rimming Handjob Engages in (Sexual) | 1 | 2.75 | 1.91 |
| Nipple Sucking Subject of (Sexual) | 3 | 1.37 | 1.91 |
| PE Teacher Role | 1 | 2.74 | 1.90 |
| Ball-cupping Subject of (Sexual) | 1 | 2.72 | 1.89 |
| Breast Smothering Engages in (Sexual) | 1 | 2.62 | 1.82 |
| Vaginal Fingering Engages in (Sexual) | 2 | 1.61 | 1.77 |
| Sixty-nine Engages in (Sexual) | 3 | 1.26 | 1.75 |
| Cunnilingus Engages in (Sexual) | 2 | 1.55 | 1.70 |
| Hard Worker Personality | 2 | 1.54 | 1.69 |
| Quiet Personality | 1 | 2.43 | 1.68 |
| Blowbang Engages in (Sexual) | 1 | 2.43 | 1.68 |
| Nursing Handjob Engages in (Sexual) | 1 | 2.41 | 1.67 |
| Student Role | 2 | 1.49 | 1.64 |
| Reverse Missionary Engages in (Sexual) | 1 | 2.35 | 1.63 |
| Ball-cupping Engages in (Sexual) | 1 | 2.31 | 1.60 |
| Housewife Role | 1 | 2.31 | 1.60 |
| Office Worker Role | 1 | 2.31 | 1.60 |
| French Kiss Engages in (Sexual) | 2 | 1.45 | 1.59 |
| Infidelity Subject of | 1 | 2.27 | 1.57 |
| Missionary Subject of (Sexual) | 3 | 1.12 | 1.55 |
| Reverse Cowgirl Engages in (Sexual) | 1 | 2.22 | 1.54 |
| Spoons Engages in (Sexual) | 1 | 2.21 | 1.53 |
| Observant Personality | 1 | 2.21 | 1.53 |
| Widow Role | 1 | 2.20 | 1.52 |
| Footjob Subject of (Sexual) | 1 | 2.17 | 1.51 |
| Half-orphan Role | 1 | 2.10 | 1.46 |
| Shopkeeper Role | 1 | 2.08 | 1.44 |
| Anilingus Subject of (Sexual) | 1 | 2.05 | 1.42 |
| Anal Fingering Engages in (Sexual) | 1 | 2.05 | 1.42 |
| Anilingus Engages in (Sexual) | 1 | 2.00 | 1.39 |
| Facesitting Engages in (Sexual) | 1 | 1.96 | 1.36 |
| Violet Hair | 2 | 1.20 | 1.32 |
| Friend Role | 2 | 1.20 | 1.31 |
| Standing Sex Engages in (Sexual) | 1 | 1.86 | 1.29 |
| Butterfly Subject of (Sexual) | 2 | 1.17 | 1.29 |
| Handjob Engages in (Sexual) | 2 | 1.15 | 1.27 |
| Husband Role | 1 | 1.79 | 1.24 |
| Infidelity Engages in | 1 | 1.79 | 1.24 |
| Spit-roast Subject of (Sexual) | 1 | 1.75 | 1.21 |
| Footjob Engages in (Sexual) | 1 | 1.72 | 1.19 |
| Quickie Fix Subject of (Sexual) | 2 | 1.08 | 1.19 |
| Cowgirl Engages in (Sexual) | 1 | 1.71 | 1.19 |
| Anal Fingering Subject of (Sexual) | 1 | 1.71 | 1.19 |
| Proactive Personality | 1 | 1.71 | 1.18 |
| Vaginal Fingering Subject of (Sexual) | 2 | 1.08 | 1.18 |
| Spoons Subject of (Sexual) | 1 | 1.67 | 1.15 |
| Father Role | 1 | 1.66 | 1.15 |
| Relaxed Personality | 1 | 1.64 | 1.13 |
| Reverse Cowgirl Subject of (Sexual) | 1 | 1.63 | 1.13 |
| Blowjob Engages in (Sexual) | 3 | 0.76 | 1.06 |
| Wife Role | 1 | 1.52 | 1.05 |
| Cowgirl Subject of (Sexual) | 2 | 0.96 | 1.05 |
| Doggy Style Subject of (Sexual) | 2 | 0.92 | 1.02 |
| Smart Personality | 1 | 1.45 | 1.01 |
| Suit Clothes | 1 | 1.44 | 1.00 |
| Black Eyes | 1 | 1.42 | 0.98 |
| Not a Virgin Role | 1 | 1.40 | 0.97 |
| High School Student Role | 2 | 0.86 | 0.95 |
| Not Sexually Involved Engages in | 1 | 1.35 | 0.94 |
| Adult Body | 1 | 1.33 | 0.92 |
| Blue Eyes | 2 | 0.81 | 0.88 |
| Childhood Friend Role | 1 | 1.26 | 0.87 |
| School Uniform Clothes | 2 | 0.77 | 0.84 |
| Friendly Personality | 1 | 1.21 | 0.84 |
| Blue Hair | 1 | 1.20 | 0.83 |
| Standing Sex Subject of (Sexual) | 1 | 1.18 | 0.81 |
| Cunnilingus Subject of (Sexual) | 1 | 1.16 | 0.80 |
| Glasses Clothes | 1 | 1.08 | 0.75 |
| Violet Eyes | 1 | 1.05 | 0.73 |
| Kind Personality | 1 | 1.02 | 0.71 |
| Virgin Sex Engages in (Sexual) | 1 | 0.85 | 0.59 |
| Black Hair | 1 | 0.80 | 0.56 |
| Brown Hair | 1 | 0.69 | 0.48 |
| Short Hair | 1 | 0.61 | 0.42 |
| Slim Body | 1 | 0.57 | 0.40 |
| Pale Body | 1 | 0.37 | 0.25 |