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Episode 1
Episode number: 1
Overview: Three boys are investigating a ruins of the old fortress during summer vacations.
Episode 2
Episode number: 2
Overview: Three boys are investigating a ruins of the old fortress during summer vacations.
Episode 3
Episode number: 3
Overview: Three boys are investigating a ruins of the old fortress during summer vacations.
Episode 4
Episode number: 4
Overview: Three boys are investigating a ruins of the old fortress during summer vacations.
Episode 5
Episode number: 5
Overview: Three boys are investigating a ruins of the old fortress during summer vacations.
Episode 6
Episode number: 6
Overview: Three boys are investigating a ruins of the old fortress during summer vacations.
Episode 7
Episode number: 7
Overview: Three boys are investigating a ruins of the old fortress during summer vacations.