- Official name：館花紗月
- English name：Satsuki Tachibana
- Chinese name：馆花纱月
- Other names：たちばな さつき
- Gender：Female
『Satsuki Tachibana』
Childhood friend of Watari, Naoto, and Watari, "Suzu"shiro. She has come back into their lives after six years.
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