7th Garden (Manga) Vol 01 (Mature)

Awyn tries to be the perfect gardener-and perfect man-to win over his human mistress. But when he unwittingly awakens an ambitious demon, he must spend his days slicing away the rotten roots of beautiful gardens worldwide with his giant sword. And now seven angels are hunting him and his demon mistress down! For older teen audiences.

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(W/A/Ca) Mitsu Izumi