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 | 2.88 | 4.64 |
| Condom Sex Engages in (Sexual) | 4 | 2.14 | 3.45 |
| Consensual Group Sex of One Female and Several Males Engages in (Sexual) | 3 | 2.48 | 3.43 |
| Twelfth Grader Role | 4 | 2.07 | 3.33 |
| Group Sex of Multiple Females and Males Engages in (Sexual) | 4 | 1.91 | 3.07 |
| Spit-roast Engages in (Sexual) | 2 | 2.44 | 2.68 |
| Sex in Front of an Audience Engages in (Sexual) | 4 | 1.50 | 2.42 |
| French Kiss Engages in (Sexual) | 4 | 1.48 | 2.38 |
| Judo Engages in | 1 | 3.39 | 2.35 |
| School Sports Club Assistant Role | 1 | 3.38 | 2.34 |
| Butterfly Engages in (Sexual) | 2 | 2.02 | 2.22 |
| Nipple Teasing Engages in (Sexual) | 2 | 2.01 | 2.21 |
| Ore Personality | 3 | 1.58 | 2.19 |
| Sex with Others Engages in (Sexual) | 2 | 1.99 | 2.19 |
| Mutual Masturbation Engages in (Sexual) | 2 | 1.94 | 2.13 |
| Cousin Role | 2 | 1.88 | 2.06 |
| Boyfriend Role | 2 | 1.86 | 2.04 |
| Childhood Friend Role | 4 | 1.26 | 2.03 |
| Used Condoms Exposition Engages in (Sexual) | 1 | 2.84 | 1.97 |
| School Basketball Club Member Role | 1 | 2.83 | 1.96 |
| Pre-Story Virginity Loss to Protagonist Role | 1 | 2.83 | 1.96 |
| Handjob Subject of (Sexual) | 2 | 1.75 | 1.93 |
| Missionary Engages in (Sexual) | 2 | 1.74 | 1.91 |
| Envious Personality | 1 | 2.73 | 1.89 |
| Sports Jersey Clothes | 1 | 2.73 | 1.89 |
| Group Sex of One Male and Several Females Engages in (Sexual) | 4 | 1.17 | 1.88 |
| Cowgirl Engages in (Sexual) | 2 | 1.71 | 1.88 |
| Student Council Vice President Role | 1 | 2.66 | 1.84 |
| Muscular Body | 2 | 1.64 | 1.81 |
| Vaginal Fingering Engages in (Sexual) | 2 | 1.61 | 1.77 |
| Rope Bondage Engages in (Sexual) | 1 | 2.54 | 1.76 |
| Basketball Engages in | 1 | 2.52 | 1.75 |
| Nipple Teasing Subject of (Sexual) | 2 | 1.57 | 1.72 |
| Girlfriend Role | 2 | 1.53 | 1.69 |
| Blowjob Subject of (Sexual) | 2 | 1.52 | 1.67 |
| Living Alone Role | 1 | 2.40 | 1.66 |
| Reverse Missionary Engages in (Sexual) | 1 | 2.36 | 1.63 |
| Tracksuit Clothes | 1 | 2.32 | 1.61 |
| Eccentric Personality | 1 | 2.29 | 1.59 |
| Polo Shirt Clothes | 1 | 2.29 | 1.59 |
| Womanizer Personality | 1 | 2.28 | 1.58 |
| Reverse Cowgirl Engages in (Sexual) | 1 | 2.22 | 1.54 |
| Large Penis Body | 1 | 2.21 | 1.53 |
| Bathroom Sex Engages in (Sexual) | 2 | 1.39 | 1.52 |
| Armband Clothes | 1 | 2.15 | 1.49 |
| Tominagi Engages in (Sexual) | 1 | 2.11 | 1.46 |
| Honor Student Role | 1 | 2.09 | 1.45 |
| Sixty-nine Engages in (Sexual) | 2 | 1.26 | 1.38 |
| Watashi Personality | 2 | 1.25 | 1.37 |
| Tanned Body | 1 | 1.90 | 1.32 |
| Quickie Fix Engages in (Sexual) | 1 | 1.88 | 1.30 |
| Cardigan Clothes | 1 | 1.87 | 1.30 |
| Butterfly Subject of (Sexual) | 2 | 1.17 | 1.29 |
| Handjob Engages in (Sexual) | 2 | 1.16 | 1.27 |
| Sitting Sex Engages in (Sexual) | 1 | 1.82 | 1.26 |
| Hidden Eyes | 1 | 1.80 | 1.25 |
| Necktie Clothes | 2 | 1.12 | 1.23 |
| School Uniform Clothes | 4 | 0.76 | 1.22 |
| Spit-roast Subject of (Sexual) | 1 | 1.75 | 1.21 |
| Reverse Missionary Subject of (Sexual) | 1 | 1.74 | 1.20 |
| Quickie Fix Subject of (Sexual) | 2 | 1.08 | 1.19 |
| Vaginal Fingering Subject of (Sexual) | 2 | 1.08 | 1.18 |
| Hoodie Clothes | 1 | 1.70 | 1.18 |
| Doggy Style Engages in (Sexual) | 1 | 1.68 | 1.17 |
| Shorts Clothes | 1 | 1.68 | 1.16 |
| Rope Bondage Subject of (Sexual) | 1 | 1.67 | 1.16 |
| Protective Personality | 1 | 1.67 | 1.16 |
| Small Breasts Body | 1 | 1.65 | 1.15 |
| Popular Role | 1 | 1.64 | 1.13 |
| Pervert Personality | 1 | 1.63 | 1.13 |
| Reverse Cowgirl Subject of (Sexual) | 1 | 1.63 | 1.13 |
| Mole Body | 1 | 1.58 | 1.09 |
| Cunnilingus Engages in (Sexual) | 1 | 1.55 | 1.07 |
| Energetic Personality | 1 | 1.52 | 1.05 |
| Cowgirl Subject of (Sexual) | 2 | 0.95 | 1.05 |
| Medium Breasts Body | 1 | 1.51 | 1.05 |
| Orange Hair | 1 | 1.51 | 1.05 |
| Serious Personality | 1 | 1.49 | 1.03 |
| Seventh Posture Subject of (Sexual) | 1 | 1.46 | 1.01 |
| Teen Body | 4 | 0.62 | 1.00 |
| Cooking Engages in | 1 | 1.42 | 0.98 |
| V Bangs Hair | 1 | 1.41 | 0.98 |
| Tank Top Clothes | 1 | 1.41 | 0.98 |
| Hairpin Clothes | 1 | 1.40 | 0.97 |
| Tominagi Subject of (Sexual) | 1 | 1.36 | 0.94 |
| Skirt Clothes | 1 | 1.34 | 0.93 |
| Ahegao Engages in (Sexual) | 1 | 1.32 | 0.92 |
| Black Hair | 2 | 0.81 | 0.89 |
| Friendly Personality | 1 | 1.22 | 0.84 |
| Blowjob Engages in (Sexual) | 2 | 0.76 | 0.84 |
| Friend Role | 1 | 1.20 | 0.83 |
| Cunnilingus Subject of (Sexual) | 1 | 1.16 | 0.81 |
| Missionary Subject of (Sexual) | 1 | 1.12 | 0.77 |
| Glasses Clothes | 1 | 1.08 | 0.75 |
| Sitting Sex Subject of (Sexual) | 1 | 1.06 | 0.74 |
| Amber Eyes | 1 | 1.03 | 0.72 |
| Green Eyes | 1 | 1.02 | 0.71 |
| Short Hair | 2 | 0.61 | 0.67 |
| 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 |
| Blond Hair | 1 | 0.89 | 0.62 |
| Blue Eyes | 1 | 0.80 | 0.56 |
| Long Hair | 1 | 0.75 | 0.52 |
| Pale Body | 3 | 0.37 | 0.51 |