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 | 2.52 | 1.75 |
| Big Breast Sizes Body | 2 | 1.55 | 1.71 |
| Shop Clerk Role | 1 | 2.42 | 1.68 |
| Weakness Subject of | 1 | 2.39 | 1.66 |
| Twin Blowjob Engages in (Sexual) | 2 | 1.45 | 1.59 |
| Blowjob Duck Face Engages in (Sexual) | 1 | 2.23 | 1.55 |
| Cowgirl Subject of (Sexual) | 4 | 0.95 | 1.53 |
| Claret Hair | 1 | 2.16 | 1.49 |
| Tominagi Subject of (Sexual) | 2 | 1.36 | 1.49 |
| Sundress Clothes | 1 | 2.14 | 1.49 |
| Virgin Sex Engages in (Sexual) | 4 | 0.85 | 1.37 |
| Anal Sex Subject of (Sexual) | 2 | 1.19 | 1.31 |
| Timid Personality | 1 | 1.86 | 1.29 |
| Group Sex of One Male and Several Females Engages in (Sexual) | 2 | 1.17 | 1.29 |
| Butterfly Subject of (Sexual) | 2 | 1.17 | 1.29 |
| Yukata Clothes | 1 | 1.85 | 1.28 |
| Doggy Style Subject of (Sexual) | 3 | 0.92 | 1.28 |
| Maid Role | 1 | 1.84 | 1.27 |
| Outdoor Sex Engages in (Sexual) | 2 | 1.16 | 1.27 |
| Handjob Engages in (Sexual) | 2 | 1.16 | 1.27 |
| String Ribbon Tie Clothes | 1 | 1.82 | 1.26 |
| Hair Ribbon Clothes | 1 | 1.80 | 1.25 |
| Big Breasts Body | 2 | 1.13 | 1.24 |
| Missionary Subject of (Sexual) | 2 | 1.12 | 1.23 |
| Hair Flower Clothes | 1 | 1.77 | 1.23 |
| Blowjob Engages in (Sexual) | 4 | 0.76 | 1.22 |
| Reverse Missionary Subject of (Sexual) | 1 | 1.74 | 1.20 |
| Quickie Fix Subject of (Sexual) | 2 | 1.08 | 1.19 |
| Naive Personality | 1 | 1.69 | 1.17 |
| Shorts Clothes | 1 | 1.68 | 1.16 |
| Rope Bondage Subject of (Sexual) | 1 | 1.67 | 1.16 |
| Spoons Subject of (Sexual) | 1 | 1.67 | 1.15 |
| Wealthy Role | 1 | 1.65 | 1.15 |
| Kind Personality | 2 | 1.03 | 1.13 |
| Maid's Headdress Clothes | 1 | 1.62 | 1.13 |
| Sex in Classroom Engages in (Sexual) | 1 | 1.61 | 1.11 |
| Bondage Sex Subject of (Sexual) | 1 | 1.58 | 1.09 |
| Maid's Dress Clothes | 1 | 1.51 | 1.05 |
| Sailor School Uniform Clothes | 1 | 1.48 | 1.02 |
| Bikini Clothes | 1 | 1.46 | 1.01 |
| Pantyhose Clothes | 1 | 1.42 | 0.99 |
| Hairpin Clothes | 1 | 1.40 | 0.97 |
| Masturbation Engages in (Sexual) | 1 | 1.39 | 0.97 |
| Grey Hair | 1 | 1.38 | 0.96 |
| Nipple Sucking Subject of (Sexual) | 1 | 1.38 | 0.96 |
| Wavy Hair | 1 | 1.36 | 0.94 |
| Waist Length+ Hair | 2 | 0.81 | 0.89 |
| Sixty-nine Engages in (Sexual) | 1 | 1.26 | 0.87 |
| Friendly Personality | 1 | 1.22 | 0.84 |
| Standing Sex Subject of (Sexual) | 1 | 1.18 | 0.81 |
| Twin Tails Hair | 1 | 1.13 | 0.78 |
| Ponytail Hair | 1 | 1.10 | 0.76 |
| Vaginal Fingering Subject of (Sexual) | 1 | 1.08 | 0.75 |
| Miniskirt Clothes | 1 | 1.06 | 0.74 |
| Violet Eyes | 1 | 1.05 | 0.72 |
| Amber Eyes | 1 | 1.03 | 0.71 |
| Green Eyes | 1 | 1.02 | 0.70 |
| Teen Body | 2 | 0.62 | 0.68 |
| Straight Hair | 1 | 0.94 | 0.65 |
| Shoulder-length Hair | 1 | 0.92 | 0.64 |
| Slim Body | 2 | 0.58 | 0.63 |
| Blond Hair | 1 | 0.89 | 0.62 |
| Black Hair | 1 | 0.80 | 0.56 |
| Blue Eyes | 1 | 0.80 | 0.56 |
| School Uniform Clothes | 1 | 0.75 | 0.52 |
| Long Hair | 1 | 0.75 | 0.52 |
| Pale Body | 2 | 0.37 | 0.40 |