Kazumi Kohinata is a major siscon for his younger sister Yuzu and her childhood friend Minatsu who calls him Kazu-nii and treats him as an elder brother despite their lack of family ties. One day his father announces that he and Kazumi's mother will be going to Las Vegas for a week along with Minatsu's parents and he must take care of both girls alone. Kazumi now has one week to get Yuzu and Minatsu to fall madly in love with him.
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| Name | Characters | Importance | Weight |
|---|---|---|---|
| Zouri Clothes | 2 | 2.39 | 2.63 |
| Ballet Engages in | 1 | 3.44 | 2.39 |
| Tribadism on Penis Engages in (Sexual) | 2 | 2.08 | 2.29 |
| Cuffs Clothes | 2 | 2.03 | 2.23 |
| Cosplay Engages in | 2 | 1.92 | 2.11 |
| Yukata Clothes | 2 | 1.85 | 2.03 |
| Intercrural Sex Engages in (Sexual) | 2 | 1.85 | 2.03 |
| Ballerina Shoes Clothes | 1 | 2.92 | 2.03 |
| Evening Gloves Clothes | 2 | 1.81 | 1.99 |
| Leg Warmers Clothes | 1 | 2.83 | 1.96 |
| Hair Flower Clothes | 2 | 1.77 | 1.94 |
| Strapless Leotard Clothes | 1 | 2.67 | 1.85 |
| Imouto Act Role | 1 | 2.58 | 1.79 |
| Maid's Headdress Clothes | 2 | 1.63 | 1.79 |
| Elementary School Student Role | 1 | 2.52 | 1.74 |
| Clothing with Ribbons Clothes | 2 | 1.57 | 1.73 |
| Kimono Clothes | 2 | 1.56 | 1.72 |
| Stockings Clothes | 1 | 2.42 | 1.68 |
| Maid's Dress Clothes | 2 | 1.51 | 1.66 |
| Group Sex Engages in (Sexual) | 2 | 1.50 | 1.65 |
| Sister Complex Personality | 1 | 2.38 | 1.65 |
| Incest Engages in (Sexual) | 2 | 1.47 | 1.61 |
| Twin Blowjob Engages in (Sexual) | 2 | 1.45 | 1.59 |
| Torn Pantyhose (damaged) Clothes | 1 | 2.21 | 1.53 |
| Masturbation Engages in (Sexual) | 2 | 1.39 | 1.53 |
| Lesbian Sex Engages in (Sexual) | 2 | 1.38 | 1.51 |
| Kid Body | 2 | 1.37 | 1.50 |
| Bukkake Subject of (Sexual) | 2 | 1.35 | 1.48 |
| Shimapan Clothes | 1 | 2.13 | 1.48 |
| Skirt Clothes | 2 | 1.33 | 1.47 |
| Third Person Personality | 1 | 2.12 | 1.47 |
| Old Type School Swimsuit Clothes | 1 | 2.09 | 1.45 |
| Flat Chest Body | 1 | 2.09 | 1.45 |
| Brother Complex Personality | 1 | 2.06 | 1.43 |
| Bow Tie Clothes | 1 | 2.04 | 1.42 |
| Dress Shoes Clothes | 1 | 2.02 | 1.40 |
| Ringlet Hair | 1 | 2.00 | 1.38 |
| Sex in Public Places Engages in (Sexual) | 2 | 1.26 | 1.38 |
| Swimming Engages in | 1 | 1.97 | 1.36 |
| Full Brother Role | 1 | 1.95 | 1.35 |
| Piledriver Subject of (Sexual) | 1 | 1.94 | 1.35 |
| Mutual Masturbation Engages in (Sexual) | 1 | 1.94 | 1.34 |
| Unusual Hair Ornaments Clothes | 1 | 1.87 | 1.30 |
| Bra Clothes | 1 | 1.87 | 1.29 |
| Outdoor Sex Engages in (Sexual) | 2 | 1.16 | 1.27 |
| Hidden Eyes | 1 | 1.81 | 1.25 |
| Bun Hair | 1 | 1.77 | 1.23 |
| Side Tail Hair | 1 | 1.75 | 1.21 |
| Reverse Missionary Subject of (Sexual) | 1 | 1.73 | 1.20 |
| Older Brother Role | 1 | 1.73 | 1.20 |
| Quickie Fix Subject of (Sexual) | 2 | 1.08 | 1.19 |
| Virgin Sex Engages in (Sexual) | 3 | 0.85 | 1.18 |
| Naive Personality | 1 | 1.69 | 1.17 |
| Sitting Sex Subject of (Sexual) | 2 | 1.06 | 1.17 |
| Shorts Clothes | 1 | 1.68 | 1.16 |
| Crop Top Clothes | 1 | 1.67 | 1.16 |
| Thigh-high Stockings Clothes | 2 | 1.04 | 1.14 |
| Mini-dress Clothes | 1 | 1.64 | 1.13 |
| Sex in Classroom Engages in (Sexual) | 1 | 1.61 | 1.11 |
| Lactation Engages in | 1 | 1.59 | 1.10 |
| Apron Clothes | 1 | 1.59 | 1.10 |
| Full Sister Role | 1 | 1.57 | 1.09 |
| Sex in Water Engages in (Sexual) | 1 | 1.56 | 1.08 |
| Cunnilingus Engages in (Sexual) | 1 | 1.55 | 1.08 |
| Sidehair Hair | 2 | 0.98 | 1.07 |
| Cowgirl Subject of (Sexual) | 2 | 0.95 | 1.05 |
| Choker Clothes | 1 | 1.50 | 1.04 |
| Pissing Engages in (Sexual) | 1 | 1.46 | 1.02 |
| Younger Sister Role | 1 | 1.44 | 1.00 |
| Pantyhose Clothes | 1 | 1.42 | 0.99 |
| Earrings Clothes | 1 | 1.42 | 0.99 |
| Tank Top Clothes | 1 | 1.42 | 0.98 |
| Hair Tie Clothes | 1 | 1.41 | 0.97 |
| Hairpin Clothes | 1 | 1.40 | 0.97 |
| Blunt Bangs Hair | 1 | 1.40 | 0.97 |
| Bathroom Sex Engages in (Sexual) | 1 | 1.39 | 0.96 |
| Female Ejaculation Engages in (Sexual) | 1 | 1.37 | 0.95 |
| Tominagi Subject of (Sexual) | 1 | 1.36 | 0.94 |
| Parted in Middle Hair | 1 | 1.25 | 0.87 |
| Blowjob Engages in (Sexual) | 2 | 0.76 | 0.84 |
| Ribbon Hair Tie Clothes | 1 | 1.19 | 0.83 |
| Anal Sex Subject of (Sexual) | 1 | 1.19 | 0.82 |
| Standing Sex Subject of (Sexual) | 1 | 1.18 | 0.82 |
| Butterfly Subject of (Sexual) | 1 | 1.17 | 0.81 |
| Cunnilingus Subject of (Sexual) | 1 | 1.16 | 0.81 |
| Twin Tails Hair | 1 | 1.13 | 0.78 |
| Vaginal Fingering Subject of (Sexual) | 1 | 1.08 | 0.75 |
| Amber Eyes | 1 | 1.03 | 0.71 |
| Doggy Style Subject of (Sexual) | 1 | 0.93 | 0.64 |
| Shoulder-length Hair | 1 | 0.92 | 0.64 |
| Slim Body | 2 | 0.58 | 0.63 |
| Blond Hair | 1 | 0.89 | 0.62 |
| Black Hair | 1 | 0.81 | 0.56 |
| Blue Eyes | 1 | 0.80 | 0.56 |
| Young-adult Body | 1 | 0.76 | 0.53 |
| Brown Hair | 1 | 0.68 | 0.47 |
| Short Hair | 1 | 0.61 | 0.42 |
| Pale Body | 2 | 0.37 | 0.41 |