Kou comes to a slum neighborhood in search of his elder brother Takumi and finds him to have become the head of a private detective firm. Kou is drafted by Takumi to do errands and chores in the detective firm, and they come to meet various interesting people...

[Source: MyAnimeList]

Unaired episode bundled with the Blu-ray release.

Unaired episode included with the Blu-ray/DVD release.