"Aikotoba", a popular matchmaking app with a feature of "finding your fated partner". The protagonist, Mizukami Takumi, is an office worker with a stable job. One day, he is recommended by his colleague to try the app. Through it, he meets a girl called “Yozora” with compatibility of 99% and gradually become closer each day. Coincidentally, Takumi is being sent for business trip to Sendai, the city of where the girl is. As a result, they decide to meet up in real life and arrange a meeting there. However, when the time comes, he wouldn’t believe what he sees. “…Onii…chan?” Under the cold sky of Sendai, Takumi didn’t expect to meet “her”… his younger sister, Uzuki, who he hasn’t see in seven years. Moreover, she is the girl under the alias “Yozora” all this time, the girl in the app who made him fall in love.
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| Name | Characters | Importance | Weight |
|---|---|---|---|
| Mobile Phone Items | 2 | 1.74 | 1.91 |
| Orphan Role | 2 | 1.70 | 1.87 |
| Non-penetrative Sex Engages in (Sexual) | 1 | 2.59 | 1.80 |
| Niece Role | 1 | 2.40 | 1.66 |
| Incest Engages in (Sexual) | 2 | 1.47 | 1.61 |
| Office Worker Role | 1 | 2.31 | 1.60 |
| Sexual Fantasy Engages in (Sexual) | 1 | 2.31 | 1.60 |
| Sexual Fantasy Subject of (Sexual) | 1 | 2.22 | 1.54 |
| Brother Complex Personality | 1 | 2.06 | 1.43 |
| Shopping Engages in | 1 | 2.04 | 1.42 |
| Emotional Personality | 1 | 2.01 | 1.39 |
| Full Brother Role | 1 | 1.95 | 1.35 |
| Mutual Masturbation Engages in (Sexual) | 1 | 1.94 | 1.34 |
| Blazer School Uniform Clothes | 1 | 1.91 | 1.33 |
| Intercrural Sex Engages in (Sexual) | 1 | 1.84 | 1.28 |
| Pretending Personality | 1 | 1.82 | 1.26 |
| Scarf Clothes | 1 | 1.78 | 1.23 |
| Pajamas Clothes | 1 | 1.75 | 1.21 |
| Cheerful Personality | 1 | 1.74 | 1.20 |
| Older Brother Role | 1 | 1.73 | 1.20 |
| Loafers Clothes | 1 | 1.71 | 1.19 |
| Sex with Protagonist Only Engages in (Sexual) | 1 | 1.68 | 1.16 |
| Spoons Subject of (Sexual) | 1 | 1.67 | 1.15 |
| Sweater Clothes | 1 | 1.63 | 1.13 |
| Sex in Classroom Engages in (Sexual) | 1 | 1.61 | 1.11 |
| Nipple Teasing Subject of (Sexual) | 1 | 1.57 | 1.09 |
| Full Sister Role | 1 | 1.56 | 1.08 |
| Hard Worker Personality | 1 | 1.54 | 1.07 |
| Pendant Necklace Clothes | 1 | 1.52 | 1.05 |
| Straight Hair | 2 | 0.94 | 1.04 |
| Bikini Clothes | 1 | 1.46 | 1.01 |
| Younger Sister Role | 1 | 1.44 | 1.00 |
| Suit Clothes | 1 | 1.44 | 1.00 |
| Pantyhose Clothes | 1 | 1.42 | 0.99 |
| Cooking Engages in | 1 | 1.42 | 0.98 |
| Gloves Clothes | 1 | 1.41 | 0.98 |
| Hairpin Clothes | 1 | 1.40 | 0.97 |
| Pleated Skirt Clothes | 1 | 1.39 | 0.97 |
| Masturbation Engages in (Sexual) | 1 | 1.39 | 0.97 |
| Female Ejaculation Engages in (Sexual) | 1 | 1.36 | 0.94 |
| Adult Body | 1 | 1.34 | 0.93 |
| Black Hair | 2 | 0.80 | 0.88 |
| Sex in Public Places Engages in (Sexual) | 1 | 1.26 | 0.87 |
| Sixty-nine Engages in (Sexual) | 1 | 1.26 | 0.87 |
| Watashi Personality | 1 | 1.25 | 0.87 |
| Ribbon Tie Clothes | 1 | 1.25 | 0.87 |
| Classmate Role | 1 | 1.23 | 0.85 |
| Friendly Personality | 1 | 1.22 | 0.84 |
| Butterfly Subject of (Sexual) | 1 | 1.17 | 0.81 |
| Cunnilingus Subject of (Sexual) | 1 | 1.16 | 0.81 |
| Handjob Engages in (Sexual) | 1 | 1.16 | 0.80 |
| Missionary Subject of (Sexual) | 1 | 1.12 | 0.77 |
| Vaginal Fingering Subject of (Sexual) | 1 | 1.08 | 0.75 |
| Miniskirt Clothes | 1 | 1.06 | 0.74 |
| Sitting Sex Subject of (Sexual) | 1 | 1.06 | 0.74 |
| Kind Personality | 1 | 1.03 | 0.71 |
| Sidehair Hair | 1 | 0.98 | 0.68 |
| Cowgirl Subject of (Sexual) | 1 | 0.95 | 0.66 |
| Doggy Style Subject of (Sexual) | 1 | 0.92 | 0.64 |
| High School Student Role | 1 | 0.85 | 0.59 |
| Virgin Sex Engages in (Sexual) | 1 | 0.85 | 0.59 |
| Waist Length+ Hair | 1 | 0.81 | 0.56 |
| Blue Eyes | 1 | 0.80 | 0.56 |
| Blowjob Engages in (Sexual) | 1 | 0.76 | 0.53 |
| Teen Body | 1 | 0.62 | 0.43 |
| Short Hair | 1 | 0.61 | 0.42 |
| Pale Body | 2 | 0.37 | 0.40 |
| Slim Body | 1 | 0.58 | 0.40 |