Akiko Yajima
Satoshi Ozaki (voice)
Bin Shimada
Kusajiro Yamashita (voice)
Issei Futamata
Shouhei Ozaki (voice)
Kikumi Umeda
Yoshio Ohkido (voice)
Kozo Shioya
Yuukichi (voice)
Sanae Kobayashi
Ryouhei Ozaki (voice)
Sayaka Aida
Toshi Sakurai (voice)
Unsho Ishizuka
George (voice)
Yuu Asakawa
Momoyo Takikawa (voice)
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
