The captain of the Hyperion does not know who he is, but he knows that he must protect the ones he loves at any cost. This is the only thing he and Otto Apocalypse have ever been able to agree on. Otto Apocalypse's purpose is to ensure that he will make her happy.

The Elysian Realm is filled with buried secrets, and Raiden Mei has only just begun to explore the dark truths that await her there. When she discovers one of the largest secrets of all, it reminds her of how much she misses her friends and how much she wants to see all of them again. Especially how much she misses the captain of the Hyperion.

Theresa Apocalypse does not have an easy job. Being one of Schicksal's only S-rank valkyries is already difficult enough. Being the headmistress of St. Freya Academy is even harder. Sometimes, she needs someone to turn to. Someone she can talk with. Someone who can make her feel safe. That person is the captain of the Hyperion.

Kiana Kaslana is in trouble. She's been doing so poorly in school that she's in danger of dropping out. The winter exams are coming up, which is an opportunity for her to turn things around - but she can't do this alone. Fortunately, the captain of the Hyperion is there to help tutor her.

The captain of the Hyperion is trapped in a coma, but this means that he belongs to only Sirin now. She will not let anyone take him away from her. Not even himself.