In the film Kimagure Orange Road: I Want to Return to That Day, Kyosuke Kasuga is the male protagonist whose prolonged indecisiveness finally reaches a crisis point. As a high school student, he is the eldest son of a family possessing psychic powers, including abilities such as teleportation, telekinesis, and limited time travel. However, in the narrative of this specific movie, the focus shifts almost entirely away from supernatural elements to a more realistic and painful emotional conflict. Kyosuke is characterized by a gentle but deeply flawed personality; he is famously indecisive and unable to clearly express his true feelings, a trait that has allowed a love triangle to persist for years. He is an ordinary student who is not particularly talented academically, but he has shown an aptitude for photography, often helping his father who works as a photographer.

Kyosuke's central motivation in the film is the desperate, yet passive, attempt to maintain the status quo, unable to choose between his earnest love for the mature Madoka Ayukawa and his protective affection for the energetic Hikaru Hiyama, whom he has been dating. His role in the story is to act as the catalyst for the inevitable and painful dissolution of the trio's friendship. The film forces him to confront the consequences of his cowardice and emotional dishonesty, as his inability to make a decision hurts all three of them. His key relationships are defined by this triangle: his deep connection with Madoka, who is growing tired of the situation, and his fraught dynamic with Hikaru, whose feelings he has been unable to reject. Kyosuke undergoes a significant, though harsh, development. Unlike the lighter tone of the television series, the movie strips away the comedic safety net, compelling Kyosuke to move from a state of passive dithering to an active, yet brutally honest, rejection that finally ends his romantic charade, leaving him isolated and miserable in the immediate aftermath. Regarding his notable abilities, while his psychic powers are an established part of his background, they are largely absent from this film’s narrative, which focuses instead on realistic emotional drama. In the second movie, Summer's Beginning, which takes place years later, an older Kyosuke has pursued a career as a photographer, working in conflict zones such as the former Yugoslavia.