Guuji Akira

A participant in the rite. The CEO of a newly established IT company rising in popularity and profits, he is absolutely certain he will win the rite from start to finish.

Fond of bragging about his achievements and his material collections, the other participants and the Mikado household are annoyed by his constant talk with the daughters frequently using any excuse to stay away from him.

Spoiler

The events in Ririka's bad ending route hint he stumbled into the shrine where the previous Miko was kept and lost his mind at the sight of her. His sanity stayed intact until he stumbled onto Tadokoro's "creation" whereupon he consumed it and then devolved into a mindless flesh-eating monster who proceeded to consume the rest of the mansion's inhabitants.