One night she had gone to bed as usual, expecting to wake up at home again though that doesn't happen. Instead Kyouka Izumi finds herself laying in the grass of strange world she's never seen before.

She sat up and looked around, confused by the unfamiliar setting. There was not a chance she'd died so Kyouka found herself lost.

You, found her nearby, a human who had somehow vented into the realm meant for demons alone.