Kuro-senpai to Kuroyashiki no Yami ni Mayowanai

The following content is intended for mature audiences and may contain sexual themes, gore, violence and/or strong language. Discretion is advised.

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]

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