"Big Sis! Marry me!" A bold confession of love, 15 years in the making. "...Yes." That confession was rewarded in the most perfect way—with a kiss. From this moment, the big sister I’ve always loved is now my fiancée. "Make me happy, okay?" "I will." I clasped her small, mismatched hands tightly and nodded with resolve. We’re both inexperienced, even when it comes to kissing, but together, we’ll learn step by step. Let’s dive deeper and deeper into this sweet, blissful love. Until our awkwardly held hands naturally fit perfectly together— This is a love story as bright and intense as the summer sun. [Translated from the official site]
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| Name | Score | Importance | Weight |
|---|---|---|---|
| Brother/Sister Romance | 2.50 | 1.93 | 4.83 |
| Blood-related Brother/Sister Incest | 3.00 | 1.49 | 4.47 |
| Childishly Violent Heroine | 2.00 | 2.19 | 4.37 |
| Salaryman Protagonist | 2.00 | 2.17 | 4.34 |
| Childhood Promise | 2.00 | 2.13 | 4.27 |
| Only Blood-related Heroines | 2.00 | 2.09 | 4.18 |
| Only Protagonist's Sisters as Heroine(s) | 2.00 | 2.00 | 4.00 |
| Summer | 2.00 | 1.67 | 3.33 |
| Slice of Life | 2.00 | 1.56 | 3.12 |
| Date Display | 2.00 | 1.49 | 2.97 |
| Only Adult Heroines | 2.00 | 1.47 | 2.93 |
| Linear Plot | 2.00 | 1.37 | 2.75 |
| Under the Same Roof | 2.00 | 1.27 | 2.55 |
| Twin Tail Heroine | 2.00 | 1.18 | 2.36 |
| Only Virgin Heroines | 2.00 | 1.09 | 2.18 |
| Only a Single Heroine | 2.00 | 0.99 | 1.97 |
| Sounds of Copulation | 1.50 | 1.29 | 1.94 |
| Wedding | 1.00 | 1.90 | 1.90 |
| Pure Love Story | 1.00 | 1.84 | 1.84 |
| Oneesan-type Heroine | 1.00 | 1.84 | 1.84 |
| Airhead Heroine | 1.00 | 1.79 | 1.79 |
| Heroine with Big Breasts | 2.00 | 0.84 | 1.68 |
| Defloration | 2.00 | 0.77 | 1.53 |
| Adult Protagonist | 1.50 | 1.01 | 1.51 |
| Protagonist with a Face | 1.00 | 0.63 | 0.63 |
| ADV | 2.00 | 0.15 | 0.29 |
| Name | Characters | Importance | Weight |
|---|---|---|---|
| Betrothed Role | 1 | 1.98 | 1.37 |
| Older Sister Role | 1 | 1.56 | 1.08 |
| Full Sister Role | 1 | 1.56 | 1.08 |
| Incest Engages in (Sexual) | 1 | 1.47 | 1.02 |
| Twin Tails Hair | 1 | 1.14 | 0.79 |
| Big Breasts Body | 1 | 1.10 | 0.76 |
| Green Eyes | 1 | 1.02 | 0.71 |
| Black Hair | 1 | 0.80 | 0.56 |
| Long Hair | 1 | 0.75 | 0.52 |