Episode 1
E1
Three boys are investigating a ruins of the old fortress during summer vacations.
Episode 2
E2
Three boys are investigating a ruins of the old fortress during summer vacations.
Episode 3
E3
Three boys are investigating a ruins of the old fortress during summer vacations.
Episode 4
E4
Three boys are investigating a ruins of the old fortress during summer vacations.
Episode 5
E5
Three boys are investigating a ruins of the old fortress during summer vacations.
Episode 6
E6
Three boys are investigating a ruins of the old fortress during summer vacations.
Episode 7
E7
Three boys are investigating a ruins of the old fortress during summer vacations.