Isshin Yuiga (唯我 一心) is a supporting character in Nanana's Buried Treasure, voiced in Japanese by Kazuyuki Okitsu. The series' music includes "【MAD】Ryuugajou（Nanana's Buried Treasure龍ヶ嬢七々々の埋蔵金OP ）", "Ryuugajou Nanana no Maizoukin - Ending HD Creditless".
