One Room Angel

Kouki and the angel attempt to determine why the angel ended up in his house, but their efforts prove fruitless.

Kouki's mom suddenly drops in, and Kouki fills in the angel on his past.

The angel realizes that only Kouki can see him, prompting Kouki to investigate why fate brought them together.

After following a trail of evidence, Kouki and the angel gradually piece together the latter's former life.

With time running out, Kouki decides to take the angel on a trip to fulfill all of the angel's long-held desires.