Nyan Tora.
にゃんトラ。
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manga Completed 2 Vol. 10 Ch.
63
-Description
From Chibi Manga:
Akira's house is in a mess because of a strange creature, a Nekomata (mythical monster who looks like a cat) who's in fact a 5 years old little child with cat-ears called Tamaki. Even if he's kind of cute, Akira is not fooled by that.
However, Tamaki decided to do anything possible to make Akira like him!