Hakanaki Rakuen

Shuu Makino is a young man who lives in a town where his parents run a small flower shop. In this town, missing people have frequently been reported. One day while Shuu was helping his parents with the store's refurbishment, he immediately loses consciousness when he witnesses a mysterious creature surrounded by countless butterflies. When he wakes up, he finds himself in a dissection laboratory owned by a peculiar creature known as the "Wildman."

(Source: Sun)