Tousei Yanagi

The adult guide for the Spring group. Prior to being put in cryogenic preservation, Yanagi was a member of the Japan Self-Defense Forces. He is an arrogant disciplinarian and a misogynist. When the conflict between him and Hana escalates, he goes missing for a while. When he returns, he claims to know a way back to the previous world.

(Source: 7Seeds Wikia)