Blackout on Sentan Island

Summary
An enemy invasion takes place and wreaks havoc on the island. Akiyuki confronts the one of the humanforms, luring it into the riverbank. Also, Akiyuki saves Haru from falling off a water pipe, holding her as he destroys the humanform. Afterwards, a mysterious girl named Nakiami reverts him to his normal self, in that he must promise to come back with her, lest he turn to stone. Aboard the postal airship Zanbani, Nakiami takes care of Akuyuki in her quarters. Meanwhile, following the aftermath of the enemy invasion, Akiyuki's friends and parents are distraught upon his sudden disappearance.