Avsnitt 4

In preparation for more Unknowns to appear, Taisei stays in Tsuruga and enjoys the railway museum he once visited with his sister. Meanwhile, Ryota is training alone to raise his Aptitude Value. Ryota has a strong admiration for the Shinkalions because a Shinkalion saved his life when he was young. Although he feels regretful that he was unable to protect Tsuruga with his own hands, he still hides his true feelings.