人の心の闇に寄り憑く“アヤカシ”が視えてしまう孤独な高校生・四月一日（ワタヌキ）。その能力を消し去り普通の生活を送りたいと願う四月一日は、ある日、一羽の蝶に導かれ、不思議な【ミセ】にたどり着く。
「どんな願いも叶えてあげる。ただし、それに見合う対価をいただく」。妖しく美しい【ミセ】の女主人・侑子（ユウコ）は、四月一日の願いを叶えるために、彼の“一番大切なもの”を差し出すように囁く。四月一日は、侑子のもとで暮らし【ミセ】を手伝うように。やがて同級生の百目鬼（ドウメキ）やひまわりとも仲を深めていき、悩みを抱えた人々と出会ううち、想像を超える大事件に巻き込まれていく――！
Watanuki, a lonely high school student who can see "Ayakashi", creatures that is obsessed with the darkness on the human heart. One day when Watanuki wants to erase his abilities and lead a normal life, he is led by a butterfly and arrives at a mysterious "Shop". "I will grant any wish, but I will get the price for it." Yuko, the mysterious and beautiful mistress of the Shop, whispers to offer his "most important thing" in order to fulfill his wishes. Watanuki starts to live with Yuko and help the Shop. Eventually he gets along with his classmates Doumeki and Himawari, and as he meets people with his worries, he gets caught up in a big incident beyond his imagination.
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