This is a story about the bonds of a lonely human boy and a lonely monster. In this story, there is another world excepting a human world. The lonely boy loses his father by a divorce of his parent, and then loses his mother in a traffic accident. While he wanders aimlessly through the town of Shibuya, he meets a party of two monsters. After that encounter, he becomes stronger.
I'm moved by the relationship between the lonely boy and the lonely monster. They oppose each other whenever occasion arises. However, they trust each other intensely in the innermost recesses of their heart. So they want to help the companion with all his strength if he gets in a fix. Though they are not parent and child, they are bound by rigid ties as if they were real parent and child.
I think that the bond of parent and child is formed by not a blood relationship but the time which they have spent together for a long time.
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