Boku to Tora-san.
From Sega Retro
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Boku to Tora-san. (ボクとトラさん。) is an app published by Sega for mobile and Android devices. The app is based around a comic strip by Mayo Kenmochi (剣持まよ) about a talking cat who is also a keychain. It was released exclusively in Japan through the PuyoSega subscription service.