The love-letters to his love-interest in the past were carelessly left out in the open for said love interest, his girlfriend to chance upon and as a result, the past life connected up to that point is explained.

In a world where a fantasy world manifesting in the middle of town is an everyday thing, a boy works for the government's Fantasy World Capture Division, and aims to be a hero.

Karugasaki Tora decided to repeat a grade and turn into a delinquent just so he could be popular, on his best friends advice. However, his plan backfired and nobody talks to him in his new classroom. The only thing he can look forward to is seeing the cute girl sitting next to him, but after trying to talk to her she immediately kicked him and threw him out the window. Later the same day, though, he saved her and a little girl from being hit by a truck. No longer able to avoid him, the girl reveals that she's a ghost playing a shinigami's game. She must get the boy she likes to return her feelings at times given by a pair of hourglasses so she can return to life, or fail and be sent to hell together. Unfortunately, her feelings have awakened for Karugasaki...

Youkai are mysterious, trouble-making spirits and demons that have tormented Japan for centuries. Kotoko’s grandfather exorcised them for a living, but Kotoko never thought that her family lineage was an asset. Then she meets Kuro, a youkai doctor. Youkai have doctors? Now Kotoko is learning firsthand that healing youkai is a lot more challenging than getting rid of them!