Wakura Mayuko, a newlywed, loses her husband to a ruthless killer and attempts suicide in her despair. Kaga Isamu, a young boy who also lost his parents to a murderer, saves her. Feeling a bond of shared sorrow, Mayuko adopts Isamu and begins a new life together. A decade later, Isamu has grown into a young man. Mayuko, with the help of her psychiatrist brother-in-law Wakura Takafumi, slowly heals from her trauma. However, as she recovers, her memories of her late husband become increasingly distant. One day, Isamu encounters a mysterious girl at a shrine who warns him that Mayuko will soon die a "psychological death" when her heart becomes void. The girl claims to have a solution to prevent this tragedy. However, it is as shocking as the prophecy itself: Isamu must undergo sexual lessons under her guidance to save Mayuko. [Translated and edited from Official Website]
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| Name | Characters | Importance | Weight |
|---|---|---|---|
| Visible Cervix Penetration Subject of (Sexual) | 3 | 2.76 | 3.83 |
| Off-The-Shoulder Kimono Clothes | 2 | 2.89 | 3.18 |
| University Teacher Role | 2 | 2.83 | 3.11 |
| Condom Sex Engages in (Sexual) | 3 | 2.14 | 2.97 |
| Hyogo Hair | 1 | 3.92 | 2.72 |
| Zouri Clothes | 2 | 2.39 | 2.63 |
| Ball-cupping Engages in (Sexual) | 2 | 2.33 | 2.56 |
| Clothing with Ribbons Clothes | 4 | 1.58 | 2.54 |
| Makeup Body | 4 | 1.53 | 2.46 |
| Non-blood-related Incest Engages in (Sexual) | 2 | 2.15 | 2.37 |
| Swordsmanship Engages in | 2 | 2.15 | 2.36 |
| Psychiatrist Role | 1 | 3.40 | 2.36 |
| Ribbon Hair Accessory Clothes | 3 | 1.66 | 2.30 |
| Shopkeeper Role | 2 | 2.09 | 2.29 |
| Parent Act Role | 1 | 3.26 | 2.26 |
| Forward Knot Obi Clothes | 1 | 3.20 | 2.22 |
| Shinai Items | 1 | 3.18 | 2.21 |
| Lactation Engages in | 3 | 1.59 | 2.20 |
| Kimono Minidress Clothes | 1 | 3.17 | 2.20 |
| Wedding Ring Clothes | 2 | 2.00 | 2.20 |
| Yamato Nadeshiko Role | 2 | 2.00 | 2.19 |
| Betrothed Role | 2 | 1.98 | 2.17 |
| Mother Complex Personality | 1 | 3.10 | 2.15 |
| Pregnant Sex Engages in (Sexual) | 3 | 1.53 | 2.13 |
| High-class Prostitute Role | 1 | 2.99 | 2.07 |
| Father Complex Personality | 1 | 2.99 | 2.07 |
| Belt Clothes | 4 | 1.27 | 2.04 |
| Brother-in-law Role | 1 | 2.90 | 2.01 |
| Chemise Clothes | 1 | 2.89 | 2.01 |
| Sword Items | 2 | 1.77 | 1.95 |
| Blunt Bangs Hair | 3 | 1.40 | 1.94 |
| Nipple Sucking Subject of (Sexual) | 3 | 1.38 | 1.91 |
| Geta Clothes | 1 | 2.72 | 1.89 |
| Braided Headband Hair | 1 | 2.60 | 1.80 |
| Kendo Engages in | 1 | 2.58 | 1.79 |
| Sidehair Hair | 5 | 0.98 | 1.75 |
| Single Parent Role | 1 | 2.50 | 1.74 |
| Adult Breast Feeding (obsolete) Engages in (Sexual) | 1 | 2.49 | 1.73 |
| Kanzashi Clothes | 1 | 2.49 | 1.72 |
| Non-blood-related Son Role | 1 | 2.49 | 1.72 |
| Kimono Clothes | 2 | 1.57 | 1.72 |
| Sitting Sex Subject of (Sexual) | 4 | 1.06 | 1.71 |
| Bodysponge Engages in (Sexual) | 1 | 2.38 | 1.65 |
| Non-blood-related Mother Role | 1 | 2.37 | 1.64 |
| Sex involving Prostitution Engages in (Sexual) | 1 | 2.37 | 1.64 |
| Standing Sex Subject of (Sexual) | 3 | 1.18 | 1.63 |
| Reincarnation Subject of | 1 | 2.33 | 1.62 |
| Cunnilingus Subject of (Sexual) | 3 | 1.16 | 1.61 |
| Transparent Clothes | 1 | 2.31 | 1.60 |
| Flower Clothes | 1 | 2.30 | 1.59 |
| Working Out Engages in | 1 | 2.27 | 1.58 |
| Tabi Clothes | 1 | 2.26 | 1.57 |
| Pantyhose Clothes | 2 | 1.42 | 1.57 |
| Missionary Subject of (Sexual) | 3 | 1.12 | 1.55 |
| Body Ribbon Clothes | 1 | 2.23 | 1.54 |
| Widow Role | 1 | 2.20 | 1.53 |
| Bathroom Sex Engages in (Sexual) | 2 | 1.39 | 1.52 |
| Straight Hair | 4 | 0.94 | 1.52 |
| Seduction Engages in | 1 | 2.17 | 1.51 |
| Hakama Clothes | 1 | 2.16 | 1.50 |
| Bukkake Subject of (Sexual) | 2 | 1.35 | 1.48 |
| Book Items | 1 | 2.12 | 1.47 |
| Skirt Clothes | 2 | 1.34 | 1.47 |
| Pubic Hair Hair | 2 | 1.34 | 1.47 |
| Wounding Subject of | 1 | 2.08 | 1.44 |
| Tiny Braid Hair | 1 | 2.07 | 1.44 |
| Amber Eyes | 3 | 1.03 | 1.43 |
| Waitstaff Uniform Clothes | 1 | 2.06 | 1.43 |
| Bow Tie Clothes | 1 | 2.04 | 1.42 |
| Ankle Socks Clothes | 1 | 2.01 | 1.39 |
| Ringlet Hair | 1 | 2.00 | 1.38 |
| Decorative Belt Clothes | 1 | 1.98 | 1.37 |
| Vaginal Gaping Engages in (Sexual) | 1 | 1.95 | 1.35 |
| Over The Knee Socks Clothes | 1 | 1.94 | 1.35 |
| Military Uniform Clothes | 1 | 1.94 | 1.35 |
| Cravat Clothes | 1 | 1.92 | 1.33 |
| Younger Brother Role | 1 | 1.90 | 1.32 |
| Grief Subject of | 1 | 1.90 | 1.31 |
| Waist Length+ Hair | 4 | 0.81 | 1.30 |
| Jealous Personality | 1 | 1.87 | 1.30 |
| Boobjob Subject of (Sexual) | 1 | 1.86 | 1.29 |
| Handjob Engages in (Sexual) | 2 | 1.16 | 1.27 |
| Waitstaff Role | 1 | 1.81 | 1.26 |
| Mature Personality | 1 | 1.81 | 1.26 |
| Hidden Eyes | 1 | 1.80 | 1.25 |
| Infidelity Engages in | 1 | 1.80 | 1.24 |
| Braid Hair | 1 | 1.78 | 1.23 |
| Hair Flower Clothes | 1 | 1.77 | 1.23 |
| Handjob Subject of (Sexual) | 1 | 1.75 | 1.21 |
| Deredere Personality | 1 | 1.74 | 1.21 |
| Cheerful Personality | 1 | 1.74 | 1.20 |
| Mischievous Personality | 1 | 1.72 | 1.19 |
| Proactive Personality | 1 | 1.71 | 1.19 |
| Reserved Personality | 1 | 1.71 | 1.19 |
| Vaginal Fingering Subject of (Sexual) | 2 | 1.08 | 1.19 |
| Orphan Role | 1 | 1.70 | 1.18 |
| Stoic Personality | 1 | 1.70 | 1.18 |
| Stubborn Personality | 1 | 1.67 | 1.16 |
| Protective Personality | 1 | 1.67 | 1.16 |
| Spoons Subject of (Sexual) | 1 | 1.67 | 1.15 |
| Parted to Side Hair | 2 | 1.05 | 1.15 |
| Relaxed Personality | 1 | 1.64 | 1.13 |
| Kind Personality | 2 | 1.03 | 1.13 |
| Maid's Headdress Clothes | 1 | 1.62 | 1.13 |
| Vaginal Fingering Engages in (Sexual) | 1 | 1.62 | 1.12 |
| Grey Eyes | 1 | 1.60 | 1.11 |
| University Student Role | 1 | 1.59 | 1.10 |
| Brown Hair | 4 | 0.68 | 1.10 |
| Apron Clothes | 1 | 1.58 | 1.10 |
| Big Breast Sizes Body | 1 | 1.55 | 1.08 |
| Blowjob Engages in (Sexual) | 3 | 0.76 | 1.06 |
| Young-adult Body | 3 | 0.76 | 1.05 |
| Energetic Personality | 1 | 1.52 | 1.05 |
| Medium Breasts Body | 1 | 1.51 | 1.05 |
| Cowgirl Subject of (Sexual) | 2 | 0.95 | 1.05 |
| Maid's Dress Clothes | 1 | 1.51 | 1.05 |
| Choker Clothes | 1 | 1.50 | 1.04 |
| Slim Body | 5 | 0.58 | 1.03 |
| Sailor School Uniform Clothes | 1 | 1.48 | 1.02 |
| Doggy Style Subject of (Sexual) | 2 | 0.92 | 1.02 |
| Seventh Posture Subject of (Sexual) | 1 | 1.46 | 1.01 |
| Smart Personality | 1 | 1.46 | 1.01 |
| Daughter Role | 1 | 1.45 | 1.01 |
| Black Eyes | 1 | 1.42 | 0.98 |
| Jacket Clothes | 1 | 1.42 | 0.98 |
| Gloves Clothes | 1 | 1.41 | 0.98 |
| Pleated Skirt Clothes | 1 | 1.39 | 0.97 |
| Tsurime Eyes | 1 | 1.38 | 0.96 |
| Wavy Hair | 1 | 1.36 | 0.94 |
| Tominagi Subject of (Sexual) | 1 | 1.36 | 0.94 |
| Fighting Engages in | 1 | 1.29 | 0.89 |
| Sex in Public Places Engages in (Sexual) | 1 | 1.26 | 0.87 |
| Classmate Role | 1 | 1.23 | 0.85 |
| Violet Hair | 1 | 1.19 | 0.83 |
| Ribbon Hair Tie Clothes | 1 | 1.19 | 0.83 |
| Butterfly Subject of (Sexual) | 1 | 1.17 | 0.81 |
| Shirt Clothes | 1 | 1.16 | 0.80 |
| Outdoor Sex Engages in (Sexual) | 1 | 1.16 | 0.80 |
| Big Breasts Body | 1 | 1.13 | 0.78 |
| Twin Tails Hair | 1 | 1.13 | 0.78 |
| Ponytail Hair | 1 | 1.10 | 0.76 |
| Glasses Clothes | 1 | 1.08 | 0.75 |
| Boobjob Engages in (Sexual) | 1 | 1.07 | 0.74 |
| Miniskirt Clothes | 1 | 1.06 | 0.74 |
| Teen Body | 2 | 0.62 | 0.68 |
| Pale Body | 5 | 0.37 | 0.66 |
| Brown Eyes | 1 | 0.90 | 0.63 |
| Virgin Sex Engages in (Sexual) | 1 | 0.85 | 0.59 |
| Black Hair | 1 | 0.80 | 0.56 |
| School Uniform Clothes | 1 | 0.75 | 0.52 |
| Long Hair | 1 | 0.75 | 0.52 |
| Short Hair | 1 | 0.61 | 0.42 |
| 1 | 0.00 | 0.00 |