百奇繚乱の館

Aoyama Yoshito is a university student in the folklore studies faculty.

When Yoshito was chasing after his faculty lecturer he ended up in a particular area, got himself lost in a mountain far from human habitation and finally arrived at a certain Western-style mansion.

This mansion was owned by the immensely wealthy family of old nobility, the Mikado clan.

Yoshito was permitted to stay at the mansion as a guest and forced to participate in the "Eigu rite" which would decide the next head of the Mikado clan.