A key part of the gameplay involves earning through daily activities and events. These points can then be used to acquire new skills. However, unlocking certain skills may require not just skill points but also a certain level of 好感度 (kōkaido) —the "affection level"—or エッチ度 (Ecchi-do) —the "erotic level". This suggests a progression system where deepening your bond with the twin sister through daily interactions and map exploration is essential before reaching more intimate scenarios.
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