Our protagonist (Shunichi) is a college student with two younger sisters who attend different schools. Though they are old enough to start living on their own, they all commute to school from their parents' house because they feel it suits their needs. However, their parents died in an accident, leaving Shunichi as their older brother and a parent figure. While he loves his two younger sisters, he gradually begins to develop desires for them. He tries not to be overly concerned about the fact that they are siblings, but the plumpness of their newly developed breasts and their clear, white skin are enough to make him want them more than ever. Then he saw one of his younger sisters masturbating, perhaps through an act of force majeure... The two sisters are aware of him as "the opposite sex", despite their different ways of expressing their affection, but what should he do as their "older brother"? [translated from DLSite]
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| Name | Characters | Importance | Weight |
|---|---|---|---|
| Twin Buttjob Engages in (Sexual) | 2 | 3.01 | 3.31 |
| Writer Role | 2 | 2.37 | 2.60 |
| Tribadism on Penis Engages in (Sexual) | 2 | 2.08 | 2.29 |
| Anilingus Subject of (Sexual) | 2 | 2.04 | 2.25 |
| Towel Clothes | 2 | 2.01 | 2.21 |
| Afro Hair | 1 | 3.07 | 2.13 |
| Pen Items | 1 | 2.74 | 1.90 |
| Not Sexually Involved Engages in (Sexual) | 3 | 1.35 | 1.88 |
| Bondage Sex Subject of (Sexual) | 2 | 1.58 | 1.73 |
| Sex in Water Engages in (Sexual) | 2 | 1.56 | 1.72 |
| Pregnant Sex Engages in (Sexual) | 2 | 1.53 | 1.68 |
| Magic Wand Subject of (Sexual) | 1 | 2.37 | 1.64 |
| Sailor School Uniform Clothes | 2 | 1.48 | 1.62 |
| Incest Engages in (Sexual) | 2 | 1.47 | 1.61 |
| Twin Blowjob Engages in (Sexual) | 2 | 1.45 | 1.59 |
| Younger Sister Role | 2 | 1.44 | 1.59 |
| Sexual Masochism Engages in (Sexual) | 1 | 2.22 | 1.54 |
| Idiot Personality | 1 | 2.21 | 1.53 |
| Masturbation Engages in (Sexual) | 2 | 1.39 | 1.53 |
| Tsurime Eyes | 2 | 1.38 | 1.52 |
| Promiscuous Personality | 1 | 2.19 | 1.52 |
| Shimapan Clothes | 1 | 2.13 | 1.48 |
| Management Role | 1 | 2.12 | 1.47 |
| Old Type School Swimsuit Clothes | 1 | 2.09 | 1.45 |
| T-shirt Clothes | 2 | 1.31 | 1.44 |
| Turtleneck Sweater Clothes | 1 | 2.04 | 1.41 |
| Sixty-nine Engages in (Sexual) | 2 | 1.26 | 1.38 |
| Facesitting Engages in (Sexual) | 1 | 1.97 | 1.37 |
| Strange Personality | 1 | 1.94 | 1.35 |
| Assertive Personality | 1 | 1.94 | 1.34 |
| Immature Personality | 1 | 1.93 | 1.34 |
| Anal Sex Subject of (Sexual) | 2 | 1.19 | 1.31 |
| Group Sex of One Male and Several Females Engages in (Sexual) | 2 | 1.17 | 1.29 |
| Cunnilingus Subject of (Sexual) | 2 | 1.16 | 1.28 |
| Honest Personality | 1 | 1.83 | 1.27 |
| Moustache Hair | 1 | 1.83 | 1.27 |
| Hidden Eyes | 1 | 1.80 | 1.25 |
| Missionary Subject of (Sexual) | 2 | 1.12 | 1.23 |
| Pajamas Clothes | 1 | 1.75 | 1.21 |
| Skirt Suit Clothes | 1 | 1.74 | 1.21 |
| Deredere Personality | 1 | 1.74 | 1.21 |
| Older Brother Role | 1 | 1.73 | 1.20 |
| Sport Bloomers Clothes | 1 | 1.72 | 1.19 |
| Quickie Fix Subject of (Sexual) | 2 | 1.08 | 1.19 |
| Vaginal Fingering Subject of (Sexual) | 2 | 1.08 | 1.19 |
| Sitting Sex Subject of (Sexual) | 2 | 1.06 | 1.17 |
| Dark Body | 1 | 1.68 | 1.16 |
| Rope Bondage Subject of (Sexual) | 1 | 1.67 | 1.16 |
| Spoons Subject of (Sexual) | 1 | 1.67 | 1.15 |
| Violet Eyes | 2 | 1.04 | 1.15 |
| Teasing Subject of | 1 | 1.65 | 1.14 |
| Sweater Clothes | 1 | 1.63 | 1.13 |
| Kouhai Role | 1 | 1.63 | 1.13 |
| Lactation Engages in | 1 | 1.59 | 1.10 |
| University Student Role | 1 | 1.59 | 1.10 |
| Makeup Body | 1 | 1.53 | 1.06 |
| Vest Clothes | 1 | 1.52 | 1.06 |
| Blowjob Subject of (Sexual) | 1 | 1.52 | 1.05 |
| Student Role | 1 | 1.49 | 1.03 |
| Pissing Engages in (Sexual) | 1 | 1.47 | 1.02 |
| Doggy Style Subject of (Sexual) | 2 | 0.92 | 1.02 |
| Knee-high Socks Clothes | 1 | 1.38 | 0.96 |
| Nipple Sucking Subject of (Sexual) | 1 | 1.38 | 0.96 |
| Tominagi Subject of (Sexual) | 1 | 1.36 | 0.94 |
| High School Student Role | 2 | 0.85 | 0.94 |
| Virgin Sex Engages in (Sexual) | 2 | 0.85 | 0.93 |
| Black Hair | 2 | 0.80 | 0.88 |
| Blue Eyes | 2 | 0.80 | 0.88 |
| Blowjob Engages in (Sexual) | 2 | 0.76 | 0.84 |
| School Uniform Clothes | 2 | 0.75 | 0.83 |
| Blue Hair | 1 | 1.19 | 0.83 |
| Long Hair | 2 | 0.75 | 0.82 |
| Shirt Clothes | 1 | 1.16 | 0.80 |
| Handjob Engages in (Sexual) | 1 | 1.16 | 0.80 |
| Outdoor Sex Engages in (Sexual) | 1 | 1.16 | 0.80 |
| Twin Tails Hair | 1 | 1.13 | 0.78 |
| Necktie Clothes | 1 | 1.12 | 0.77 |
| Brown Hair | 2 | 0.68 | 0.75 |
| Parted to Side Hair | 1 | 1.05 | 0.73 |
| Thigh-high Stockings Clothes | 1 | 1.04 | 0.72 |
| Kind Personality | 1 | 1.03 | 0.71 |
| Short Hair | 2 | 0.61 | 0.67 |
| Cowgirl Subject of (Sexual) | 1 | 0.95 | 0.66 |
| Brown Eyes | 1 | 0.90 | 0.62 |
| Blond Hair | 1 | 0.89 | 0.62 |
| Waist Length+ Hair | 1 | 0.81 | 0.56 |