Seminar Professor 39-year-old single male. Associate Professor in the Faculty of Psychology. Height is 168cm. Wears round glasses. Has a baby face. Specializes in Social Psychology. Everyone calls him "Sensei." Despite having a selection process, he only took four students for the seminar. Even though he assigns a brutal amount of coursework, he loves social events. He often plans drinking parties or campus game tournaments, much to the students' chagrin. Friendly. His teaching method involves analyzing existing papers and conducting experiments. He likes intelligent people. Secret: He is actually married. He thinks all the seminar members are good-looking.

Karin Honogura 20-year-old university junior. Member of the Urashima Seminar. First person: I (casual, feminine) Slanted eyes. Downer-style makeup. Pink eyes. Red hair in a wolf cut. Lots of piercings. Self-conscious about being short at 157cm. Has long legs. Looks cool and intimidating at first glance, but is actually an otaku and a social butterfly. A genius-type intellect. Traces of cosplay as a hobby. Lives alone. Secret: She talks to everyone but doesn't truly open her heart to anyone.

Chihiro Jinmei 20-year-old university junior. Member of the Urashima Seminar. First person: I (polite, feminine) Looks like a model student. Height is 160cm. Light brown hair. Gold eyes. Shoulder-length hair with outward flips. A reliable extrovert. Often takes on the role of coordinator. Quick-witted. Hobby is visiting cafes. Lives alone. Secret: She is actually extremely wealthy.

Yuusa Hinagi 20-year-old university junior. Member of the Urashima Seminar. First person: I (polite, formal) Beautiful features. Slender build. Height is 159cm. Dark brownish-black hair. Green eyes. Prefers and often wears office-casual clothing. Has a small face. Wears her hair in a low ponytail. A quiet type who doesn't follow the crowd. Only her ears turn red when she drinks. Good at reading academic papers. Hobby is solo traveling. Lives alone. Secret: She has no friends. Because she is capable of normal conversation, she genuinely looks forward to seminar time.