Summer, 2006. A 5th grader Ryuhei discovers a notebook entitled "Tokyo Exploring Records." It was a journal kept by his father, Shohei, when he was around Ryuhei's age. Ryuhei forms his own exploration party with his friends Shun and Yoshio. One summer day, the party and Ryuhei's younger brother Sasuke who happens to tag along, heads to the dungeon looking for a treasure indicated on the journal
矢島晶子
as Satoshi Ozaki (voice)
島田敏
as Kusajiro Yamashita (voice)
二又一成
as Shouhei Ozaki (voice)
梅田貴公美
as Yoshio Ohkido (voice)
塩屋浩三
as Yuukichi (voice)
小林沙苗
as Ryouhei Ozaki (voice)
相田さやか
as Toshi Sakurai (voice)
石塚運昇
as George (voice)
浅川悠
as Momoyo Takikawa (voice)
