Yuuma and his girlfriend Hiromi. Yamato and his girlfriend Himari. They've been friends for years. One day while staying at their friends Yuuma and Hiromi catch Himari and Yamato having sex so Himari suggests having sex together where they can watch each other. Next, to add excitement she suggests swapping partners. However when it turns out that Yamato is far better at satisfying his girlfriend Hiromi than he is, Yuuma feels inadequate as a lover.
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| Name | Characters | Importance | Weight |
|---|---|---|---|
| Swinging Engages in | 4 | 2.91 | 4.69 |
| Consensual Group Sex of One Female and Several Males Engages in (Sexual) | 3 | 2.54 | 3.53 |
| Condom Sex Engages in (Sexual) | 4 | 2.15 | 3.47 |
| Twelfth Grader Role | 4 | 2.06 | 3.32 |
| Group Sex of Multiple Females and Males Engages in (Sexual) | 4 | 1.94 | 3.12 |
| Spit-roast Engages in (Sexual) | 2 | 2.45 | 2.69 |
| French Kiss Engages in (Sexual) | 4 | 1.52 | 2.45 |
| Sex in Front of an Audience Engages in (Sexual) | 4 | 1.51 | 2.43 |
| School Sports Club Assistant Role | 1 | 3.40 | 2.36 |
| Judo Engages in | 1 | 3.37 | 2.33 |
| Butterfly Engages in (Sexual) | 2 | 2.04 | 2.24 |
| Nipple Teasing Engages in (Sexual) | 2 | 2.04 | 2.24 |
| Ore Personality | 3 | 1.59 | 2.20 |
| Sex with Others Engages in (Sexual) | 2 | 1.99 | 2.18 |
| Mutual Masturbation Engages in (Sexual) | 2 | 1.93 | 2.12 |
| Cousin Role | 2 | 1.88 | 2.06 |
| Boyfriend Role | 2 | 1.87 | 2.06 |
| Childhood Friend Role | 4 | 1.25 | 2.01 |
| Used Condoms Exposition Engages in (Sexual) | 1 | 2.86 | 1.98 |
| Pre-Story Virginity Loss to Protagonist Role | 1 | 2.84 | 1.97 |
| School Basketball Club Member Role | 1 | 2.84 | 1.97 |
| Handjob Subject of (Sexual) | 2 | 1.76 | 1.93 |
| Group Sex of One Male and Several Females Engages in (Sexual) | 4 | 1.19 | 1.92 |
| Missionary Engages in (Sexual) | 2 | 1.75 | 1.92 |
| Sports Jersey Clothes | 1 | 2.76 | 1.91 |
| Envious Personality | 1 | 2.74 | 1.90 |
| Cowgirl Engages in (Sexual) | 2 | 1.72 | 1.89 |
| Student Council Vice President Role | 1 | 2.65 | 1.83 |
| Muscular Body | 2 | 1.65 | 1.81 |
| Vaginal Fingering Engages in (Sexual) | 2 | 1.62 | 1.78 |
| Basketball Engages in | 1 | 2.54 | 1.76 |
| Rope Bondage Engages in (Sexual) | 1 | 2.54 | 1.76 |
| Nipple Teasing Subject of (Sexual) | 2 | 1.59 | 1.75 |
| Girlfriend Role | 2 | 1.55 | 1.70 |
| Blowjob Subject of (Sexual) | 2 | 1.53 | 1.68 |
| Reverse Missionary Engages in (Sexual) | 1 | 2.38 | 1.65 |
| Living Alone Role | 1 | 2.38 | 1.65 |
| Tracksuit Clothes | 1 | 2.32 | 1.61 |
| Polo Shirt Clothes | 1 | 2.31 | 1.60 |
| Eccentric Personality | 1 | 2.30 | 1.59 |
| Womanizer Personality | 1 | 2.29 | 1.59 |
| Large Penis Body | 1 | 2.24 | 1.56 |
| Reverse Cowgirl Engages in (Sexual) | 1 | 2.24 | 1.56 |
| Bathroom Sex Engages in (Sexual) | 2 | 1.39 | 1.53 |
| Armband Clothes | 1 | 2.14 | 1.48 |
| Tominagi Engages in (Sexual) | 1 | 2.14 | 1.48 |
| Honor Student Role | 1 | 2.08 | 1.44 |
| Watashi Personality | 2 | 1.26 | 1.39 |
| Sixty-nine Engages in (Sexual) | 2 | 1.25 | 1.38 |
| Tanned Body | 1 | 1.92 | 1.33 |
| Quickie Fix Engages in (Sexual) | 1 | 1.89 | 1.31 |
| Cardigan Clothes | 1 | 1.88 | 1.31 |
| Butterfly Subject of (Sexual) | 2 | 1.17 | 1.29 |
| Handjob Engages in (Sexual) | 2 | 1.16 | 1.27 |
| Sitting Sex Engages in (Sexual) | 1 | 1.83 | 1.27 |
| Hidden Eyes | 1 | 1.81 | 1.25 |
| Necktie Clothes | 2 | 1.11 | 1.22 |
| Spit-roast Subject of (Sexual) | 1 | 1.74 | 1.21 |
| Reverse Missionary Subject of (Sexual) | 1 | 1.73 | 1.20 |
| Hoodie Clothes | 1 | 1.71 | 1.19 |
| Vaginal Fingering Subject of (Sexual) | 2 | 1.08 | 1.18 |
| School Uniform Clothes | 4 | 0.74 | 1.18 |
| Quickie Fix Subject of (Sexual) | 2 | 1.08 | 1.18 |
| Protective Personality | 1 | 1.70 | 1.18 |
| Small Breasts Body | 1 | 1.70 | 1.18 |
| Doggy Style Engages in (Sexual) | 1 | 1.70 | 1.18 |
| Shorts Clothes | 1 | 1.67 | 1.16 |
| Rope Bondage Subject of (Sexual) | 1 | 1.67 | 1.16 |
| Pervert Personality | 1 | 1.65 | 1.14 |
| Reverse Cowgirl Subject of (Sexual) | 1 | 1.64 | 1.14 |
| Popular Role | 1 | 1.64 | 1.13 |
| Mole Body | 1 | 1.62 | 1.12 |
| Cunnilingus Engages in (Sexual) | 1 | 1.56 | 1.08 |
| Medium Breasts Body | 1 | 1.55 | 1.07 |
| Energetic Personality | 1 | 1.53 | 1.06 |
| Cowgirl Subject of (Sexual) | 2 | 0.95 | 1.05 |
| Orange Hair | 1 | 1.51 | 1.04 |
| Serious Personality | 1 | 1.50 | 1.04 |
| Seventh Posture Subject of (Sexual) | 1 | 1.45 | 1.01 |
| Tank Top Clothes | 1 | 1.43 | 0.99 |
| Teen Body | 4 | 0.61 | 0.99 |
| V Bangs Hair | 1 | 1.42 | 0.98 |
| Cooking Engages in | 1 | 1.41 | 0.98 |
| Hairpin Clothes | 1 | 1.39 | 0.97 |
| Tominagi Subject of (Sexual) | 1 | 1.36 | 0.94 |
| Ahegao Engages in (Sexual) | 1 | 1.33 | 0.92 |
| Skirt Clothes | 1 | 1.33 | 0.92 |
| Black Hair | 2 | 0.81 | 0.89 |
| Friendly Personality | 1 | 1.23 | 0.85 |
| Friend Role | 1 | 1.21 | 0.84 |
| Blowjob Engages in (Sexual) | 2 | 0.76 | 0.84 |
| Cunnilingus Subject of (Sexual) | 1 | 1.17 | 0.81 |
| Missionary Subject of (Sexual) | 1 | 1.11 | 0.77 |
| Glasses Clothes | 1 | 1.08 | 0.75 |
| Sitting Sex Subject of (Sexual) | 1 | 1.05 | 0.73 |
| Amber Eyes | 1 | 1.02 | 0.71 |
| Green Eyes | 1 | 1.01 | 0.70 |
| Short Hair | 2 | 0.61 | 0.67 |
| Doggy Style Subject of (Sexual) | 1 | 0.92 | 0.64 |
| Shoulder-length Hair | 1 | 0.91 | 0.63 |
| Brown Eyes | 1 | 0.90 | 0.62 |
| Blond Hair | 1 | 0.88 | 0.61 |
| Blue Eyes | 1 | 0.80 | 0.55 |
| Long Hair | 1 | 0.75 | 0.52 |
| Pale Body | 3 | 0.37 | 0.51 |