Tasuku Kuresawa is a high school student who shares a first-year class with Yoshikazu Miyano. He sports short black hair, rectangular dark glasses, and typically wears his school uniform without a tie, often adding a sweater. Standing around 174-175 cm tall, he casually expresses a desire to reach 175 cm. An astronomy club member, he maintains a long-term relationship with a girlfriend from another school, demonstrating loyalty through regular visits on his way home. Kuresawa possesses a perceptive nature, quickly recognizing the mutual romantic feelings between Sasaki and Miyano despite their efforts to conceal it. His acquaintance with Sasaki began when Sasaki intervened to prevent Kuresawa from being assaulted, leading Kuresawa to regard Sasaki with respect as an upperclassman; they maintain a friendly but not particularly close dynamic. His role within Miyano's circle evolves after Sasaki graduates. By Miyano's third year, Kuresawa changes classes to focus on college entrance exam preparations, influenced by graduated seniors. His development includes growing openness; initially not shown directly engaging with BL content, he later begins lending and borrowing BL manga with his girlfriend. He also advises Miyano on planning a birthday date for Sasaki. During this period, he is indirectly involved in group activities, such as an outing where Miyano and Sasaki are tailed to an aquarium, with Kuresawa's participation occurring off-panel.