* Based on a shounen manga by Matra Milan, serialised in Monthly Dragon Age.

Seven years ago, Amakawa Yuuto's parents died leaving him behind to live alone without a single relative. Ever since then, his childhood friend, Kuzaki Rinko, has woken him up, cooked for him and generally taken care of him. The only family-related thing left to him is a mysterious charm, a red ball given to him by his grandparents as a good luck charm, an omamori.

From the day of his 16th birthday, his charm is said to not be able to protect him from evil spirits any more, and into Yuuto's life walks Himari. A cat spirit-samurai girl and demon huntress who, aside from wanting to copulate with him madly, swears to protect Yuuto. Unfortunately, Yuuto has a severe allergic reaction to cats.

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