Yousuke's sister disappeared one day, and even as the adults seem to despair and give up, Yousuke never did. Then one day, he goes down to the spot where she had disappeared and there waiting for him was... ...

After an unexpected accident, distraught Tsubaki Tsukishiro is left in denial of his sister's death. But after a moment of despair, he has an epiphany,"I don't need to exist if my sister is here." Donning h...