Due to messing with his grandfather's machine, the protagonist and his 2 cousins have switched body. They try to switch back right away but the machine breaks. And thus, they are stuck inside each other's bodies for a while. [Translated from Official Site]
Seikan Shimai has not appeared in our Steam sample enough to calculate it's similar novels... sorry!
A novel needs atleast 20 owners before it's similarity is calculated.
| Name | Score | Importance | Weight |
|---|---|---|---|
| Body Swapped Sex | 2.00 | 3.25 | 6.50 |
| Body Swapping | 2.50 | 2.49 | 6.22 |
| Protagonist's Cousin as a Heroine | 3.00 | 1.89 | 5.68 |
| Rimming Handjob | 2.00 | 2.44 | 4.88 |
| Genderbent Sex | 2.00 | 2.28 | 4.56 |
| Cousin Incest | 2.00 | 2.02 | 4.04 |
| Protagonist's Childhood Friend as a Heroine | 3.00 | 1.14 | 3.43 |
| Facesitting | 2.00 | 1.65 | 3.30 |
| Double Handjob | 2.00 | 1.64 | 3.29 |
| Heroine with Big Breasts | 3.00 | 0.84 | 2.51 |
| Lesbian Sex | 2.00 | 1.16 | 2.31 |
| Group Sex of One Female and Several Males | 2.00 | 1.05 | 2.09 |
| Cunnilingus | 2.00 | 0.93 | 1.87 |
| Defloration | 2.00 | 0.77 | 1.53 |
| Nukige | 2.00 | 0.65 | 1.31 |
| Group Sex of One Male and Several Females | 1.00 | 0.91 | 0.91 |
| Male Protagonist | 2.00 | 0.30 | 0.61 |
| ADV | 2.50 | 0.15 | 0.36 |
| Name | Characters | Importance | Weight |
|---|---|---|---|
| Body Swap Engages in | 3 | 2.88 | 4.00 |
| Tribadism Engages in (Sexual) | 4 | 2.11 | 3.40 |
| Cousin Role | 3 | 1.87 | 2.60 |
| Cunnilingus Engages in (Sexual) | 4 | 1.55 | 2.49 |
| Vaginal + Anal Object Insertion Subject of (Sexual) | 2 | 2.24 | 2.46 |
| Vaginal Fingering Engages in (Sexual) | 3 | 1.61 | 2.23 |
| Lesbian Sex Engages in (Sexual) | 4 | 1.38 | 2.22 |
| Genderbent Sex Engages in (Sexual) | 1 | 3.10 | 2.15 |
| Spit-roast Subject of (Sexual) | 2 | 1.75 | 1.92 |
| Cunnilingus Subject of (Sexual) | 3 | 1.16 | 1.61 |
| Object Insertion Subject of (Sexual) | 1 | 2.17 | 1.50 |
| Boobs on Glass Subject of (Sexual) | 1 | 2.16 | 1.50 |
| Vaginal Fingering Subject of (Sexual) | 3 | 1.08 | 1.49 |
| Odango Hair | 1 | 2.15 | 1.49 |
| Sixty-nine Engages in (Sexual) | 2 | 1.26 | 1.39 |
| Anilingus Engages in (Sexual) | 1 | 2.00 | 1.39 |
| Double Handjob Engages in (Sexual) | 1 | 1.89 | 1.31 |
| Group Sex of One Male and Several Females Engages in (Sexual) | 2 | 1.16 | 1.28 |
| Footjob Engages in (Sexual) | 1 | 1.72 | 1.19 |
| Boobjob Engages in (Sexual) | 2 | 1.07 | 1.18 |
| Violet Eyes | 2 | 1.05 | 1.15 |
| Sweater Clothes | 1 | 1.63 | 1.13 |
| Reverse Cowgirl Subject of (Sexual) | 1 | 1.63 | 1.13 |
| Grey Eyes | 1 | 1.60 | 1.11 |
| University Student Role | 1 | 1.58 | 1.09 |
| Blowjob Subject of (Sexual) | 1 | 1.52 | 1.05 |
| Student Role | 1 | 1.49 | 1.04 |
| Sailor School Uniform Clothes | 1 | 1.48 | 1.02 |
| Pissing Engages in (Sexual) | 1 | 1.47 | 1.02 |
| Incest Engages in (Sexual) | 1 | 1.47 | 1.02 |
| Smart Personality | 1 | 1.45 | 1.01 |
| Masturbation Engages in (Sexual) | 1 | 1.41 | 0.97 |
| Brown Hair | 3 | 0.69 | 0.95 |
| High School Student Role | 2 | 0.86 | 0.95 |
| Virgin Sex Engages in (Sexual) | 2 | 0.85 | 0.94 |
| Childhood Friend Role | 1 | 1.26 | 0.87 |
| Ribbon Tie Clothes | 1 | 1.26 | 0.87 |
| Blowjob Engages in (Sexual) | 2 | 0.76 | 0.84 |
| Violet Hair | 1 | 1.20 | 0.83 |
| Anal Sex Subject of (Sexual) | 1 | 1.19 | 0.82 |
| Trousers Clothes | 1 | 1.18 | 0.82 |
| Outdoor Sex Engages in (Sexual) | 1 | 1.16 | 0.80 |
| Shirt Clothes | 1 | 1.16 | 0.80 |
| Handjob Engages in (Sexual) | 1 | 1.15 | 0.80 |
| Missionary Subject of (Sexual) | 1 | 1.12 | 0.78 |
| Miniskirt Clothes | 1 | 1.06 | 0.74 |
| Spiky Bangs Hair | 1 | 0.99 | 0.69 |
| Sidehair Hair | 1 | 0.98 | 0.68 |
| Cowgirl Subject of (Sexual) | 1 | 0.96 | 0.66 |
| Straight Hair | 1 | 0.94 | 0.65 |
| Doggy Style Subject of (Sexual) | 1 | 0.92 | 0.64 |
| Shoulder-length Hair | 1 | 0.92 | 0.64 |
| Brown Eyes | 1 | 0.90 | 0.62 |
| Waist Length+ Hair | 1 | 0.82 | 0.57 |
| Black Hair | 1 | 0.80 | 0.56 |