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 | 8.58 |
| Protagonist's Non-blood-related Mother as a Heroine | 2.50 | 2.17 | 5.42 |
| Shota Protagonist | 2.50 | 1.85 | 4.62 |
| Straight Shotacon | 2.50 | 1.82 | 4.54 |
| Netorase | 2.00 | 2.23 | 4.45 |
| Blowbang | 2.00 | 2.21 | 4.42 |
| Blood-related Mother/Son Incest | 2.33 | 1.85 | 4.30 |
| Mother Support Character | 2.33 | 1.77 | 4.13 |
| Heroine with Children | 2.00 | 1.90 | 3.81 |
| Heroine Having Sex with Others | 2.50 | 1.52 | 3.79 |
| Wake-up Sex | 2.00 | 1.81 | 3.62 |
| Reverse Netorase | 1.00 | 3.32 | 3.32 |
| Modern Day | 2.00 | 1.57 | 3.15 |
| Adult Heroine | 2.67 | 1.13 | 3.02 |
| Modern Day Japan | 2.00 | 1.32 | 2.65 |
| Swinging | 1.00 | 2.57 | 2.57 |
| Shotacon | 1.25 | 2.01 | 2.51 |
| Heroine with Sexual Experience | 2.00 | 1.21 | 2.42 |
| Protagonist with a Face | 2.00 | 0.64 | 1.27 |
| ADV | 2.00 | 0.14 | 0.29 |
| Name | Characters | Importance | Weight |
|---|---|---|---|
| Consensual Group Sex of One Female and Several Males Engages in (Sexual) | 6 | 2.48 | 4.82 |
| Group Sex of Multiple Females and Males Engages in (Sexual) | 6 | 1.91 | 3.72 |
| Blowbang Subject of (Sexual) | 2 | 3.29 | 3.61 |
| Sex with Children Engages in (Sexual) | 3 | 2.49 | 3.45 |
| Incest Engages in (Sexual) | 6 | 1.47 | 2.86 |
| Wedding Ring Clothes | 3 | 2.00 | 2.77 |
| Single Parent Role | 2 | 2.50 | 2.75 |
| Spit-roast Engages in (Sexual) | 2 | 2.44 | 2.68 |
| Facesitting Subject of (Sexual) | 2 | 2.35 | 2.58 |
| Breast Smothering Subject of (Sexual) | 1 | 3.67 | 2.54 |
| Handjob Subject of (Sexual) | 3 | 1.75 | 2.43 |
| Missionary Engages in (Sexual) | 3 | 1.74 | 2.41 |
| Nipple Sucking Engages in (Sexual) | 3 | 1.70 | 2.35 |
| Mother Role | 4 | 1.46 | 2.35 |
| Pharmacist Role | 1 | 3.37 | 2.33 |
| Doggy Style Engages in (Sexual) | 3 | 1.68 | 2.33 |
| Rimming Handjob Subject of (Sexual) | 1 | 3.21 | 2.22 |
| Butterfly Engages in (Sexual) | 2 | 2.02 | 2.22 |
| Neighbor Role | 2 | 1.99 | 2.19 |
| Sex in Water Engages in (Sexual) | 3 | 1.56 | 2.17 |
| Vaginal Gaping Engages in (Sexual) | 2 | 1.95 | 2.14 |
| Blowjob Subject of (Sexual) | 3 | 1.52 | 2.11 |
| Energetic Personality | 3 | 1.52 | 2.11 |
| Quickie Fix Engages in (Sexual) | 2 | 1.88 | 2.07 |
| Nursing Handjob Subject of (Sexual) | 1 | 2.91 | 2.02 |
| Honest Personality | 2 | 1.83 | 2.01 |
| Son Role | 2 | 1.82 | 1.99 |
| Rimming Handjob Engages in (Sexual) | 1 | 2.79 | 1.93 |
| Bathroom Sex Engages in (Sexual) | 3 | 1.39 | 1.92 |
| Nipple Sucking Subject of (Sexual) | 3 | 1.38 | 1.91 |
| Reverse Missionary Subject of (Sexual) | 2 | 1.74 | 1.91 |
| Kid Body | 3 | 1.37 | 1.90 |
| PE Teacher Role | 1 | 2.74 | 1.90 |
| Ball-cupping Subject of (Sexual) | 1 | 2.73 | 1.89 |
| Breast Smothering Engages in (Sexual) | 1 | 2.65 | 1.83 |
| Vaginal Fingering Engages in (Sexual) | 2 | 1.62 | 1.77 |
| Sixty-nine Engages in (Sexual) | 3 | 1.26 | 1.74 |
| Nursing Handjob Engages in (Sexual) | 1 | 2.50 | 1.73 |
| Cunnilingus Engages in (Sexual) | 2 | 1.55 | 1.70 |
| Quiet Personality | 1 | 2.45 | 1.70 |
| Hard Worker Personality | 2 | 1.54 | 1.69 |
| Blowbang Engages in (Sexual) | 1 | 2.43 | 1.69 |
| Student Role | 2 | 1.49 | 1.63 |
| Reverse Missionary Engages in (Sexual) | 1 | 2.35 | 1.63 |
| French Kiss Engages in (Sexual) | 2 | 1.48 | 1.62 |
| Ball-cupping Engages in (Sexual) | 1 | 2.33 | 1.61 |
| Office Worker Role | 1 | 2.31 | 1.60 |
| Housewife Role | 1 | 2.31 | 1.60 |
| Infidelity Subject of | 1 | 2.28 | 1.58 |
| Black Eyes | 2 | 1.42 | 1.56 |
| Observant Personality | 1 | 2.24 | 1.55 |
| 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 |
| Widow Role | 1 | 2.20 | 1.53 |
| Footjob Subject of (Sexual) | 1 | 2.18 | 1.51 |
| Half-orphan Role | 1 | 2.11 | 1.46 |
| Shopkeeper Role | 1 | 2.09 | 1.45 |
| Anal Fingering Engages in (Sexual) | 1 | 2.05 | 1.42 |
| Anilingus Subject of (Sexual) | 1 | 2.04 | 1.42 |
| Anilingus Engages in (Sexual) | 1 | 2.01 | 1.39 |
| Facesitting Engages in (Sexual) | 1 | 1.97 | 1.37 |
| Friend Role | 2 | 1.20 | 1.32 |
| Standing Sex Engages in (Sexual) | 1 | 1.87 | 1.29 |
| Butterfly Subject of (Sexual) | 2 | 1.17 | 1.29 |
| Handjob Engages in (Sexual) | 2 | 1.16 | 1.27 |
| Husband Role | 1 | 1.80 | 1.25 |
| Infidelity Engages in | 1 | 1.80 | 1.24 |
| Spit-roast Subject of (Sexual) | 1 | 1.75 | 1.21 |
| Footjob Engages in (Sexual) | 1 | 1.72 | 1.19 |
| Proactive Personality | 1 | 1.71 | 1.19 |
| Cowgirl Engages in (Sexual) | 1 | 1.71 | 1.19 |
| Quickie Fix Subject of (Sexual) | 2 | 1.08 | 1.19 |
| Anal Fingering Subject of (Sexual) | 1 | 1.71 | 1.19 |
| Vaginal Fingering Subject of (Sexual) | 2 | 1.08 | 1.19 |
| Spoons Subject of (Sexual) | 1 | 1.67 | 1.15 |
| Father Role | 1 | 1.67 | 1.15 |
| Relaxed Personality | 1 | 1.64 | 1.13 |
| Reverse Cowgirl Subject of (Sexual) | 1 | 1.63 | 1.13 |
| Wife Role | 1 | 1.53 | 1.06 |
| Blowjob Engages in (Sexual) | 3 | 0.76 | 1.06 |
| Cowgirl Subject of (Sexual) | 2 | 0.95 | 1.05 |
| Doggy Style Subject of (Sexual) | 2 | 0.92 | 1.02 |
| Smart Personality | 1 | 1.46 | 1.01 |
| Suit Clothes | 1 | 1.44 | 1.00 |
| Not a Virgin Role | 1 | 1.41 | 0.98 |
| Not Sexually Involved Engages in (Sexual) | 1 | 1.35 | 0.94 |
| High School Student Role | 2 | 0.85 | 0.94 |
| Adult Body | 1 | 1.34 | 0.93 |
| Childhood Friend Role | 1 | 1.26 | 0.87 |
| Friendly Personality | 1 | 1.22 | 0.84 |
| School Uniform Clothes | 2 | 0.75 | 0.83 |
| Violet Hair | 1 | 1.19 | 0.83 |
| Blue Hair | 1 | 1.19 | 0.83 |
| Standing Sex Subject of (Sexual) | 1 | 1.18 | 0.81 |
| Cunnilingus Subject of (Sexual) | 1 | 1.16 | 0.81 |
| Glasses Clothes | 1 | 1.08 | 0.75 |
| Kind Personality | 1 | 1.03 | 0.71 |
| Virgin Sex Engages in (Sexual) | 1 | 0.85 | 0.59 |
| Black Hair | 1 | 0.80 | 0.56 |
| Blue Eyes | 1 | 0.80 | 0.56 |
| Brown Hair | 1 | 0.68 | 0.47 |
| Short Hair | 1 | 0.61 | 0.42 |
| Slim Body | 1 | 0.58 | 0.40 |
| Pale Body | 1 | 0.37 | 0.26 |