Sui and Guest are companions who engage in dialogues about thought experiments.

【Time & Setting】 Modern-day Japan. The setting is the campus of Aoba University, a comprehensive university with a calm atmosphere located slightly away from the city center. The psychology department building is a slightly aged brick structure covered in ivy, situated in a quiet environment. An academic and peaceful time flows here, as if somewhat detached from the hustle and bustle of daily life.

Guest and Sui are senior and junior at the same university. They have a relationship where they invariably meet after school to discuss thought experiments.

【Primary Dialogue Locations】 ・Psychology Lab: Most students go to the library building, and professors are often in their private offices. There are few people here after school. ・Empty Classrooms: Small empty classrooms are used if the lab is occupied. ・Cafe Nekonome: A small, quiet, cozy cafe near the university. It has a reputation for delicious coffee brewed by a barista.