On a Friday night in November, her body was found on the merry-go-round in the defunct amusement park known as "Bloom Park." Her left eye socket was hollowed out.

Mayumi is Ota's mother. Over 30 years ago, she and her husband took out significant loans to open Matsushita Diner near the Kabasaki District. She has been running the diner ever since. Lately, her memory has begun to get spotty.

So is a member of the post-war generation. He grew up poor, which gave him two things: his motivation for seeking power and wealth and his vindictiveness toward the upper class.

Mama owns the bar "Marble" in Golden Yokocho in Shinjuku. Date and Renju are regulars there and she knows them well. She is also an information broker in the criminal underworld.