• is the primary
protagonist of the game. He is 20 years old, a failed student who works at the used bookstore Umebachidō in Jinbōchō. Daydreamer and aspiring writer, the story is told from his perspective and his experiences with the repeating rainy three-day loop drive the narrative. • is one of Tamamori's childhood friends, a 21-year-old gentle, bookish student who attends the Imperial University. Kind, somewhat bumbling, and devoted to books. His presence is emotionally important to Tamamori as he mostly appreciates his works. • is a 20-year-old genius student who attends the Imperial University's medical department. A childhood friend of Tamamori and Minakami; intelligent, sarcastic, and emotionally complex. He mostly admires Hanazawa, likes making fun of Tamamori and criticising his works. • , is a 23-year-old, serious and stoic former military cadet. A childhood friend of Tamamori; blunt, hot-blooded, and protective, with a strong passion of justice and righteousness for his nation. Also a best friend of Hikawa, where they also work together in the Army Scientific Research Unit. • often referred to as “Hakase” / “Professor”; a 24-year-old eyepatch-wearing inventor. Polite, nervous, and brilliant, he's involved in the story's more scientific/occult investigations. Appears to have become a regular customer at the Umebachidō only after Tamamori started working there. • ; a mysterious, taciturn figure who lives in the bookstore's basement and wears a Noh mask. Violent and enigmatic; he figures centrally in the darker, supernatural events and is tied into Tamamori's routes. == Development ==