Masayuki is suspected of killing his ex-wife when the police find her dead. There was a message written in blood on her hand that put Masayuki at a great disadvantage. The only one who can vouch for his innocence with an alibi was Yuki-Onna, who was with him at the time of the murder. But there's no way he can let a yokai provide a statement for him. Yuki-Onna asks Kotoko for help to track down the real killer.
and they don't usually specifically 
know what day it is like humans do.
.وعادة لا يعرفون بالتّحديد ما هو اليوم مثلما يفعل البشر
Sie wissen für gewöhnlich nicht einmal,
was für ein Tag es gerade bei den Menschen ist.
Contrairement aux humains,
e non è detto che sappiano dire con esattezza
Também não sabem o dia
ao certo como os humanos.
Поэтому, в отличие от нас, людей,
они не всегда знают, какой сегодня день.