Haruka Hoshimiya is a character from the second season of the anime series Active Raid. She is identifiable by her blue hair and serves as the focal point of an episode in the season. Her most defining characteristic is an all-consuming passion for trains, which forms the core of her personality and actions.

Within the story, Haruka is depicted as a character whose life and emotions are deeply intertwined with railways and train dioramas. Her motivation is rooted in the inspiration she drew from the detailed train dioramas created by another character, Kobari. This inspiration is so profound that it fuels her central conflict when Kobari engages in criminal activities. She confronts him directly, arguing that his actions are a betrayal of the very trains he loves. Her earnest belief is that his passion for trains should not be corrupted or overshadowed by his quest for revenge.

Haruka's role in the episode is to serve as the emotional core, driving the resolution of that specific incident. She does not show notable special abilities or combat skills, but rather relies on her sincere and heartfelt convictions. Her key relationship is with Kobari, whom she sees as a mentor figure whose work ignited her own passion. Her development is shown through her confrontation with him, where she evolves from an admirer of his work to a character who challenges him on his chosen path. Her sincere and passionate nature is highlighted during this encounter, as she delivers a heartfelt speech that compares human relationships to trains traveling together on the same track. The episode focuses heavily on her perspective, using her love for trains as the primary lens through which the story's drama is resolved.