It is summer break and Keima intends to spend all his time on video games. An old acquaintance, the timid girl Tenri, comes back into the neighborhood - and apparently has a lost soul inside her. It is up to Keima and Elysia to unravel the secrets of her heart.

Keima and Tenri hide from Nora in a tunnel that somehow seems very familiar. The being which is possessing Tenri finally reveals what happened between them 10 years ago.