大河内 十蔵

Riku's grandfather.

On the surface, he's the president of a massive real estate company, but because he wields significant influence in political and business circles - both domestically and internationally - he's constantly surrounded by shady rumors. Outside of his public image, he's a self-centered, lecherous old man. Everything about him, from his height to his thought process, is unconventional and inexplicable.