Ryuuichirou Kuroda

Оригінальне ім’я: 黒田龍一郎

[Kumiko](https://anilist.co/character/798/)'s grandfather. A kind, wise old man who loves Kumiko very much, and is always there to support her and give advice. He took Kumiko in after her parents died. Though crime rookies might believe he is a man of little importance due to his yakuza branch only having a few members, he is actually highly respected in the underworld.