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
| Visual Effects | Mitsuhiro Sato | Compositing Artist |
| Editing | Takeshi Seyama | Editor |
| Crew | Katsuhiro Otomo | Creator |
| Visual Effects | Katsuhiro Otomo | Character Designer |
| Visual Effects | Hidekazu Ohara | Character Designer |
| Art | Junichi Taniguchi | Art Direction |
| Visual Effects | Hiroki Yamada | Modeling |
| Visual Effects | Tomonari Nakajima | Animation |
| Visual Effects | Masashi Kokubo | CGI Director |
| Visual Effects | Nagisa Abe | Color Designer |
| Sound | Yoshihiro Ike | Music |
| Visual Effects | Takashi Hashimoto | Special Effects Supervisor |
| Visual Effects | Hidekazu Ohara | Animation Director |
| Production | Hideo Matsushita | Production Manager |
| Sound | Keiichi Momose | Sound Director |
| Visual Effects | Mitsunori Murata | Animation Production Assistant |
| Directing | Shinji Takagi | Director |
| Writing | Sadayuki Murai | Screenplay |
