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 | 3.03 | 3.33 |
| Writer Role | 2 | 2.37 | 2.60 |
| Tribadism on Penis Engages in (Sexual) | 2 | 2.08 | 2.29 |
| Anilingus Subject of (Sexual) | 2 | 2.05 | 2.26 |
| Towel Clothes | 2 | 2.02 | 2.22 |
| Afro Hair | 1 | 3.07 | 2.13 |
| Pen Items | 1 | 2.73 | 1.89 |
| Not Sexually Involved Engages in (Sexual) | 3 | 1.36 | 1.89 |
| Bondage Sex Subject of (Sexual) | 2 | 1.56 | 1.72 |
| Sex in Water Engages in (Sexual) | 2 | 1.56 | 1.71 |
| 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 | 1.63 |
| Incest Engages in (Sexual) | 2 | 1.47 | 1.62 |
| Twin Blowjob Engages in (Sexual) | 2 | 1.44 | 1.58 |
| Younger Sister Role | 2 | 1.44 | 1.58 |
| Promiscuous Personality | 1 | 2.26 | 1.57 |
| Idiot Personality | 1 | 2.22 | 1.54 |
| Sexual Masochism Engages in (Sexual) | 1 | 2.20 | 1.53 |
| Tsurime Eyes | 2 | 1.38 | 1.51 |
| Masturbation Engages in (Sexual) | 2 | 1.37 | 1.51 |
| Management Role | 1 | 2.14 | 1.49 |
| Shimapan Clothes | 1 | 2.12 | 1.47 |
| T-shirt Clothes | 2 | 1.32 | 1.45 |
| Old Type School Swimsuit Clothes | 1 | 2.08 | 1.44 |
| Turtleneck Sweater Clothes | 1 | 2.05 | 1.42 |
| Facesitting Engages in (Sexual) | 1 | 2.00 | 1.38 |
| Sixty-nine Engages in (Sexual) | 2 | 1.25 | 1.38 |
| Assertive Personality | 1 | 1.96 | 1.36 |
| Strange Personality | 1 | 1.94 | 1.35 |
| Immature Personality | 1 | 1.94 | 1.34 |
| Group Sex of One Male and Several Females Engages in (Sexual) | 2 | 1.19 | 1.31 |
| Anal Sex Subject of (Sexual) | 2 | 1.19 | 1.30 |
| Cunnilingus Subject of (Sexual) | 2 | 1.17 | 1.29 |
| Honest Personality | 1 | 1.84 | 1.28 |
| Moustache Hair | 1 | 1.83 | 1.27 |
| Hidden Eyes | 1 | 1.81 | 1.25 |
| Missionary Subject of (Sexual) | 2 | 1.11 | 1.22 |
| Deredere Personality | 1 | 1.75 | 1.21 |
| Pajamas Clothes | 1 | 1.75 | 1.21 |
| Skirt Suit Clothes | 1 | 1.74 | 1.21 |
| Older Brother Role | 1 | 1.72 | 1.20 |
| Vaginal Fingering Subject of (Sexual) | 2 | 1.08 | 1.18 |
| Sport Bloomers Clothes | 1 | 1.71 | 1.18 |
| Quickie Fix Subject of (Sexual) | 2 | 1.08 | 1.18 |
| Dark Body | 1 | 1.70 | 1.18 |
| Teasing Subject of | 1 | 1.68 | 1.16 |
| Rope Bondage Subject of (Sexual) | 1 | 1.67 | 1.16 |
| Sitting Sex Subject of (Sexual) | 2 | 1.05 | 1.16 |
| Spoons Subject of (Sexual) | 1 | 1.67 | 1.16 |
| Violet Eyes | 2 | 1.04 | 1.14 |
| Sweater Clothes | 1 | 1.64 | 1.14 |
| Kouhai Role | 1 | 1.62 | 1.12 |
| University Student Role | 1 | 1.62 | 1.12 |
| Lactation Engages in | 1 | 1.59 | 1.10 |
| Makeup Body | 1 | 1.57 | 1.09 |
| Blowjob Subject of (Sexual) | 1 | 1.53 | 1.06 |
| Vest Clothes | 1 | 1.53 | 1.06 |
| Student Role | 1 | 1.48 | 1.03 |
| Doggy Style Subject of (Sexual) | 2 | 0.92 | 1.01 |
| Pissing Engages in (Sexual) | 1 | 1.46 | 1.01 |
| Nipple Sucking Subject of (Sexual) | 1 | 1.39 | 0.96 |
| Knee-high Socks Clothes | 1 | 1.37 | 0.95 |
| Tominagi Subject of (Sexual) | 1 | 1.36 | 0.94 |
| Virgin Sex Engages in (Sexual) | 2 | 0.84 | 0.93 |
| High School Student Role | 2 | 0.84 | 0.92 |
| Black Hair | 2 | 0.81 | 0.89 |
| Blue Eyes | 2 | 0.80 | 0.88 |
| Blowjob Engages in (Sexual) | 2 | 0.76 | 0.84 |
| Long Hair | 2 | 0.75 | 0.83 |
| Blue Hair | 1 | 1.19 | 0.82 |
| School Uniform Clothes | 2 | 0.74 | 0.81 |
| Handjob Engages in (Sexual) | 1 | 1.16 | 0.80 |
| Outdoor Sex Engages in (Sexual) | 1 | 1.16 | 0.80 |
| Shirt Clothes | 1 | 1.15 | 0.80 |
| Twin Tails Hair | 1 | 1.12 | 0.78 |
| Necktie Clothes | 1 | 1.11 | 0.77 |
| Brown Hair | 2 | 0.68 | 0.75 |
| Parted to Side Hair | 1 | 1.07 | 0.74 |
| Kind Personality | 1 | 1.04 | 0.72 |
| Thigh-high Stockings Clothes | 1 | 1.03 | 0.72 |
| 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 | 0.88 | 0.61 |
| Waist Length+ Hair | 1 | 0.80 | 0.55 |