Reviews

This anime is so humanities. A girl who lost in the dark just to find out the person who gave her heart and say "thank you". A man who just want his sister to thank him for everything he did. When both find out each other, battles between them come up because of misunderstanding and bad communication. But after all, they all find out the truth. But sadly, that man love the girl so much and doesnt want her to go then he accepts to let her go and he's the only one in the world need to sarcrifice and save people from being lost.
It's so true in real life, the last person in this world always suffer lonely until "someone" can find and free them.
Perfect anime, OP is extremely good.

Overall : 10/10
Refuse to elaborate further !