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 | 8.57 |
| Protagonist's Non-blood-related Mother as a Heroine | 2.50 | 2.16 | 5.39 |
| Shota Protagonist | 2.50 | 1.85 | 4.62 |
| Straight Shotacon | 2.50 | 1.81 | 4.53 |
| Netorase | 2.00 | 2.26 | 4.52 |
| Blowbang | 2.00 | 2.20 | 4.40 |
| Blood-related Mother/Son Incest | 2.33 | 1.84 | 4.29 |
| Mother Support Character | 2.33 | 1.77 | 4.13 |
| Heroine with Children | 2.00 | 1.96 | 3.91 |
| Heroine Having Sex with Others | 2.50 | 1.52 | 3.80 |
| Wake-up Sex | 2.00 | 1.82 | 3.64 |
| Reverse Netorase | 1.00 | 3.39 | 3.39 |
| Modern Day | 2.00 | 1.56 | 3.12 |
| Adult Heroine | 2.67 | 1.13 | 3.02 |
| Modern Day Japan | 2.00 | 1.32 | 2.63 |
| Swinging | 1.00 | 2.58 | 2.58 |
| Shotacon | 1.25 | 1.99 | 2.48 |
| Heroine with Sexual Experience | 2.00 | 1.22 | 2.45 |
| Protagonist with a Face | 2.00 | 0.65 | 1.31 |
| ADV | 2.00 | 0.14 | 0.29 |
| Name | Characters | Importance | Weight |
|---|---|---|---|
| Consensual Group Sex of One Female and Several Males Engages in (Sexual) | 6 | 2.54 | 4.95 |
| Group Sex of Multiple Females and Males Engages in (Sexual) | 6 | 1.94 | 3.77 |
| Blowbang Subject of (Sexual) | 2 | 3.32 | 3.65 |
| Sex with Children Engages in (Sexual) | 3 | 2.52 | 3.49 |
| Incest Engages in (Sexual) | 6 | 1.47 | 2.87 |
| Single Parent Role | 2 | 2.56 | 2.81 |
| Wedding Ring Clothes | 3 | 2.01 | 2.78 |
| Spit-roast Engages in (Sexual) | 2 | 2.45 | 2.69 |
| Breast Smothering Subject of (Sexual) | 1 | 3.82 | 2.65 |
| Facesitting Subject of (Sexual) | 2 | 2.37 | 2.60 |
| Handjob Subject of (Sexual) | 3 | 1.76 | 2.44 |
| Missionary Engages in (Sexual) | 3 | 1.75 | 2.42 |
| Nipple Sucking Engages in (Sexual) | 3 | 1.71 | 2.38 |
| Pharmacist Role | 1 | 3.41 | 2.37 |
| Mother Role | 4 | 1.47 | 2.36 |
| Doggy Style Engages in (Sexual) | 3 | 1.70 | 2.35 |
| Rimming Handjob Subject of (Sexual) | 1 | 3.26 | 2.26 |
| Butterfly Engages in (Sexual) | 2 | 2.04 | 2.24 |
| Neighbor Role | 2 | 2.00 | 2.19 |
| Sex in Water Engages in (Sexual) | 3 | 1.56 | 2.16 |
| Vaginal Gaping Engages in (Sexual) | 2 | 1.96 | 2.15 |
| Blowjob Subject of (Sexual) | 3 | 1.53 | 2.12 |
| Energetic Personality | 3 | 1.53 | 2.11 |
| Nursing Handjob Subject of (Sexual) | 1 | 3.03 | 2.10 |
| Quickie Fix Engages in (Sexual) | 2 | 1.89 | 2.08 |
| Honest Personality | 2 | 1.84 | 2.02 |
| Son Role | 2 | 1.83 | 2.01 |
| Rimming Handjob Engages in (Sexual) | 1 | 2.86 | 1.98 |
| Ball-cupping Subject of (Sexual) | 1 | 2.79 | 1.93 |
| Bathroom Sex Engages in (Sexual) | 3 | 1.39 | 1.93 |
| Nipple Sucking Subject of (Sexual) | 3 | 1.39 | 1.93 |
| PE Teacher Role | 1 | 2.75 | 1.91 |
| Reverse Missionary Subject of (Sexual) | 2 | 1.73 | 1.91 |
| Kid Body | 3 | 1.36 | 1.89 |
| Breast Smothering Engages in (Sexual) | 1 | 2.67 | 1.85 |
| Vaginal Fingering Engages in (Sexual) | 2 | 1.62 | 1.78 |
| Nursing Handjob Engages in (Sexual) | 1 | 2.57 | 1.78 |
| Quiet Personality | 1 | 2.52 | 1.75 |
| Sixty-nine Engages in (Sexual) | 3 | 1.25 | 1.74 |
| Cunnilingus Engages in (Sexual) | 2 | 1.56 | 1.72 |
| Blowbang Engages in (Sexual) | 1 | 2.46 | 1.71 |
| Hard Worker Personality | 2 | 1.54 | 1.70 |
| French Kiss Engages in (Sexual) | 2 | 1.52 | 1.67 |
| Reverse Missionary Engages in (Sexual) | 1 | 2.38 | 1.65 |
| Ball-cupping Engages in (Sexual) | 1 | 2.36 | 1.63 |
| Student Role | 2 | 1.48 | 1.63 |
| Infidelity Subject of | 1 | 2.33 | 1.62 |
| Office Worker Role | 1 | 2.31 | 1.60 |
| Housewife Role | 1 | 2.31 | 1.60 |
| Observant Personality | 1 | 2.30 | 1.59 |
| Black Eyes | 2 | 1.43 | 1.57 |
| Reverse Cowgirl Engages in (Sexual) | 1 | 2.24 | 1.56 |
| Spoons Engages in (Sexual) | 1 | 2.23 | 1.55 |
| Missionary Subject of (Sexual) | 3 | 1.11 | 1.54 |
| Widow Role | 1 | 2.22 | 1.54 |
| 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 | 2.06 | 1.43 |
| Anilingus Subject of (Sexual) | 1 | 2.05 | 1.42 |
| Anilingus Engages in (Sexual) | 1 | 2.01 | 1.40 |
| Facesitting Engages in (Sexual) | 1 | 2.00 | 1.38 |
| Friend Role | 2 | 1.21 | 1.33 |
| Standing Sex Engages in (Sexual) | 1 | 1.88 | 1.31 |
| Butterfly Subject of (Sexual) | 2 | 1.17 | 1.29 |
| Handjob Engages in (Sexual) | 2 | 1.16 | 1.27 |
| Infidelity Engages in | 1 | 1.82 | 1.26 |
| Husband Role | 1 | 1.82 | 1.26 |
| Proactive Personality | 1 | 1.75 | 1.21 |
| Spit-roast Subject of (Sexual) | 1 | 1.74 | 1.21 |
| Cowgirl Engages in (Sexual) | 1 | 1.72 | 1.19 |
| Anal Fingering Subject of (Sexual) | 1 | 1.71 | 1.19 |
| Footjob Engages in (Sexual) | 1 | 1.71 | 1.19 |
| Vaginal Fingering Subject of (Sexual) | 2 | 1.08 | 1.18 |
| Quickie Fix Subject of (Sexual) | 2 | 1.08 | 1.18 |
| Father Role | 1 | 1.68 | 1.16 |
| Spoons Subject of (Sexual) | 1 | 1.67 | 1.16 |
| Relaxed Personality | 1 | 1.64 | 1.14 |
| Reverse Cowgirl Subject of (Sexual) | 1 | 1.64 | 1.14 |
| Wife Role | 1 | 1.55 | 1.07 |
| Blowjob Engages in (Sexual) | 3 | 0.76 | 1.05 |
| Cowgirl Subject of (Sexual) | 2 | 0.95 | 1.05 |
| Smart Personality | 1 | 1.47 | 1.02 |
| Doggy Style Subject of (Sexual) | 2 | 0.92 | 1.01 |
| Not a Virgin Role | 1 | 1.45 | 1.00 |
| Suit Clothes | 1 | 1.44 | 1.00 |
| Not Sexually Involved Engages in (Sexual) | 1 | 1.36 | 0.94 |
| Adult Body | 1 | 1.36 | 0.94 |
| High School Student Role | 2 | 0.84 | 0.92 |
| Childhood Friend Role | 1 | 1.25 | 0.87 |
| Friendly Personality | 1 | 1.23 | 0.85 |
| Violet Hair | 1 | 1.19 | 0.82 |
| Blue Hair | 1 | 1.19 | 0.82 |
| Standing Sex Subject of (Sexual) | 1 | 1.18 | 0.82 |
| Cunnilingus Subject of (Sexual) | 1 | 1.17 | 0.81 |
| School Uniform Clothes | 2 | 0.74 | 0.81 |
| Glasses Clothes | 1 | 1.08 | 0.75 |
| Kind Personality | 1 | 1.04 | 0.72 |
| Virgin Sex Engages in (Sexual) | 1 | 0.84 | 0.58 |
| Black Hair | 1 | 0.81 | 0.56 |
| Blue Eyes | 1 | 0.80 | 0.55 |
| Brown Hair | 1 | 0.68 | 0.47 |
| Short Hair | 1 | 0.61 | 0.42 |
| Slim Body | 1 | 0.57 | 0.40 |
| Pale Body | 1 | 0.37 | 0.26 |