Masked Mansion

A masked man named Kazamori Sasa just bursts into flames on the seventh anniversary of his father's death. The dad, Komamori, was a brilliant researcher who could make an AI that could break the Turing test. However, he only appeared in public wearing a mask. Sometime during his research he was killed in an explosion, only leaving behind his son Kazamori to continue his work.

The rest of the Sasa family are ready to claim the action was a suicide, but Rie Kaishou calls upon Shinjurou to help find out the real truth behind Kazamori's death before her father and the government gets involved in the case.