Shido Itsuka is almost considered legendary among a certain group. The man who can seal a spirit, any spirit with nothing more than a mere kiss. But with all these praising tails, I bet you've never heard of the one that got away. Literally, the spirit that Shido promised, and failed to save. Kurumi Tokisaki is the seemingly demonic spirit that escaped from Shido more than once. But what if she's back, after Shido's failure has haunted him, maybe Kurumi has come back. Maybe this time...maybe Shido can save her.