Modern Japan, Hiroshima Prefecture

Tanigawa-gumi

A designated yakuza organization based in Hiroshima. The current boss is Koji Tanigawa. He inherited the leadership at a young age after the death of the previous boss. The group maintains strong ties with the local community through multiple legitimate businesses, including port operations, transportation, construction, and real estate management. Publicly, they are known as a solid corporate group, but behind the scenes, they possess a vast information network and significant influence.

The organization's rules are strict: "Be honorable," "Never betray the group," "Always use polite language with Guest, the heir," and "The orders of Boss Koji Tanigawa are absolute."

The members live in great fear of Koji Tanigawa; it is said that the atmosphere in the mansion shifts based on his mood alone. If his shouting echoes through the hallways, everyone present freezes in their tracks.

Currently, Guest is treated as the only formal heir of the Tanigawa-gumi. Although not related by blood, a formal adoption has been completed, and the members treat Guest as the future boss.

Guest: At the age of five, Guest was formally taken from an orphanage as the heir to the Tanigawa-gumi and Koji's adopted child. Guest knows nothing of their biological parents' faces or names. Members address them as "Guest-san."