Shinichi visits his grandparents on the countryside. There he meets a sickly ojousama, Asami, and got reacquainted with a girl he doesn't recall so well, Mari. What he thought to be a calm romantic summer vacation turns out to be a shameful erotic mishap when a mischievous girl pulled a prank on him. He's tricked to eat a mushroom that causes him to have erection round the clock. Shinichi the erection prince, as townsfolk calls him, swore vengeance. But first of all, he has to calm his penis down.
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| Name | Characters | Importance | Weight |
|---|---|---|---|
| Sun Hat Clothes | 1 | 2.71 | 1.88 |
| New Type School Swimsuit Clothes | 1 | 2.51 | 1.74 |
| Shop Clerk Role | 1 | 2.44 | 1.69 |
| Weakness Subject of | 1 | 2.39 | 1.66 |
| Big Breast Sizes Body | 2 | 1.47 | 1.62 |
| Twin Blowjob Engages in (Sexual) | 2 | 1.44 | 1.58 |
| Blowjob Duck Face Engages in (Sexual) | 1 | 2.23 | 1.54 |
| Cowgirl Subject of (Sexual) | 4 | 0.95 | 1.53 |
| Tominagi Subject of (Sexual) | 2 | 1.36 | 1.49 |
| Claret Hair | 1 | 2.15 | 1.49 |
| Sundress Clothes | 1 | 2.13 | 1.47 |
| Virgin Sex Engages in (Sexual) | 4 | 0.84 | 1.36 |
| Group Sex of One Male and Several Females Engages in (Sexual) | 2 | 1.19 | 1.31 |
| Anal Sex Subject of (Sexual) | 2 | 1.19 | 1.30 |
| Big Breasts Body | 2 | 1.19 | 1.30 |
| Timid Personality | 1 | 1.87 | 1.30 |
| Butterfly Subject of (Sexual) | 2 | 1.17 | 1.29 |
| Maid Role | 1 | 1.85 | 1.28 |
| Yukata Clothes | 1 | 1.85 | 1.28 |
| Doggy Style Subject of (Sexual) | 3 | 0.92 | 1.28 |
| Handjob Engages in (Sexual) | 2 | 1.16 | 1.27 |
| Outdoor Sex Engages in (Sexual) | 2 | 1.16 | 1.27 |
| String Ribbon Tie Clothes | 1 | 1.81 | 1.26 |
| Hair Ribbon Clothes | 1 | 1.77 | 1.23 |
| Blowjob Engages in (Sexual) | 4 | 0.76 | 1.22 |
| Missionary Subject of (Sexual) | 2 | 1.11 | 1.22 |
| Hair Flower Clothes | 1 | 1.76 | 1.22 |
| Reverse Missionary Subject of (Sexual) | 1 | 1.73 | 1.20 |
| Naive Personality | 1 | 1.71 | 1.18 |
| Quickie Fix Subject of (Sexual) | 2 | 1.08 | 1.18 |
| Shorts Clothes | 1 | 1.67 | 1.16 |
| Rope Bondage Subject of (Sexual) | 1 | 1.67 | 1.16 |
| Spoons Subject of (Sexual) | 1 | 1.67 | 1.16 |
| Wealthy Role | 1 | 1.66 | 1.15 |
| Kind Personality | 2 | 1.04 | 1.14 |
| Maid's Headdress Clothes | 1 | 1.62 | 1.12 |
| Sex in Classroom Engages in (Sexual) | 1 | 1.61 | 1.12 |
| Bondage Sex Subject of (Sexual) | 1 | 1.56 | 1.08 |
| Maid's Dress Clothes | 1 | 1.51 | 1.05 |
| Sailor School Uniform Clothes | 1 | 1.48 | 1.03 |
| Bikini Clothes | 1 | 1.46 | 1.01 |
| Pantyhose Clothes | 1 | 1.42 | 0.98 |
| Hairpin Clothes | 1 | 1.39 | 0.97 |
| Nipple Sucking Subject of (Sexual) | 1 | 1.39 | 0.96 |
| Grey Hair | 1 | 1.39 | 0.96 |
| Masturbation Engages in (Sexual) | 1 | 1.37 | 0.95 |
| Wavy Hair | 1 | 1.36 | 0.94 |
| Waist Length+ Hair | 2 | 0.80 | 0.88 |
| Sixty-nine Engages in (Sexual) | 1 | 1.25 | 0.87 |
| Friendly Personality | 1 | 1.23 | 0.85 |
| Standing Sex Subject of (Sexual) | 1 | 1.18 | 0.82 |
| Twin Tails Hair | 1 | 1.12 | 0.78 |
| Ponytail Hair | 1 | 1.10 | 0.76 |
| Vaginal Fingering Subject of (Sexual) | 1 | 1.08 | 0.75 |
| Miniskirt Clothes | 1 | 1.07 | 0.74 |
| Violet Eyes | 1 | 1.04 | 0.72 |
| Amber Eyes | 1 | 1.02 | 0.71 |
| Green Eyes | 1 | 1.01 | 0.70 |
| Teen Body | 2 | 0.61 | 0.67 |
| Straight Hair | 1 | 0.96 | 0.66 |
| Shoulder-length Hair | 1 | 0.91 | 0.63 |
| Slim Body | 2 | 0.57 | 0.63 |
| Blond Hair | 1 | 0.88 | 0.61 |
| Black Hair | 1 | 0.81 | 0.56 |
| Blue Eyes | 1 | 0.80 | 0.55 |
| Long Hair | 1 | 0.75 | 0.52 |
| School Uniform Clothes | 1 | 0.74 | 0.51 |
| Pale Body | 2 | 0.37 | 0.41 |