在黑学姐与黑屋子的黑暗中不再迷惘 / 黒先輩と黒屋敷の闇に迷わない / No Getting Lost in the Dark of the Black Mansion with the Black Sempai
Rank: 8th, it has 22880 monthly / 24761 total views.
Authors: Aeba fuchi / Kokuryuugan
Genres: Manga / Shounen / Drama / Ecchi / Mystery / Romance
Status: Completed
Summary:
Reiichi heads off for a part-time job interview, hoping to get money for a new bike, and his self-styled servant Kuro-senpai tags along. The "interview" is in a western-style mansion, but no one seems to be around. The two of them end up locked in the mansion and must find their way out!

Based on the horror-style exploration/ero-game of the same name.

[From tethysdust]