Kyosuke Masuda is a character from the anime High Score, primarily recognized for his relationship with Emika Matsumoto. He is depicted as a young man whose true physical capabilities are somewhat unknown to himself, though he possesses considerable strength and stamina. His most defining characteristic is an extraordinary level of resilience, particularly in the context of his interactions with Emika.

Masuda’s personality is marked by a notable submissive or masochistic streak, a trait that develops and becomes more pronounced over the course of the story. This is most clearly illustrated in the circumstances surrounding the beginning of his romantic relationship with Emika. In a specific incident, he was instructed to endure Emika’s violent behavior for a duration of five seconds. Demonstrating his surprising fortitude and perhaps his growing compatibility with her, Masuda got back up in only three seconds, and the pair officially became lovers. This event encapsulates his role in the narrative as Emika’s love interest, a position that requires him to withstand her forceful and often aggressive personality.

The development of Masuda’s character is closely tied to his discovery of this M side of his nature, which seems to be cultivated through his ongoing dynamic with Emika. While he is not the protagonist, his function in the story is integral as he becomes the official boyfriend, willingly placing himself in a situation that would overwhelm most others. His notable ability, therefore, is not a traditional skill but his immense physical endurance and his capacity to endure and even thrive under Emika’s violent affections, a feat that few other characters could manage.