Hiragi has a distinct hairstyle featuring dyed yellow-blonde highlights layered over his natural dark brown hair, with his fringe parted to either side. His hair is short enough to leave his ears visible. He typically wears a white collared shirt left untucked over gray trousers, with the top button undone. A light green tie featuring darker green diagonal stripes hangs loosely around his neck. His school uniform includes a dark green blazer with the white sleeve cuffs casually rolled up to his forearms. Notably, Hiragi wears three white hoop earrings on his left ear and completes his look with a pair of laced boots.

Hiragi is characterized by his gentle and caring nature, often showing deep concern for the well-being of those around him. He is supportive and encouraging, particularly toward his close friends. Highly perceptive, Hiragi has a keen ability to read the emotions and thoughts of others, especially those he has known for a long time. Despite his kind personality, he occasionally takes on a scolding tone in conversation and can act flippant at times, adding complexity to his otherwise thoughtful character.

Hiragi Kashima grew up alongside Yuki Yoshida and Shizusumi Yagi, forming a close-knit group of childhood friends who shared a passion for music. During their earlier years, the trio formed a band, with Hiragi playing bass. Their bond, however, was deeply impacted by the tragic death of Yuki, which left emotional scars on those closest to him including Hiragi.

He later becomes connected to Mafuyu Satō, Yuki’s boyfriend, through their shared past and emotional ties to the guitar Yuki once used. Though Hiragi has moved on academically and personally, he remains linked to the lingering emotions surrounding their past. Throughout the story, he is shown to be in a relationship with Shizusumi, and the two often appear together, providing subtle insight into how each has coped with their shared history.

Yuki Yoshida
Hiragi was childhood friends with Yuki and played in a band with him and Shizusumi Yagi. The two shared a close bond, and Yuki’s sudden death had a lasting impact on Hiragi. Though he tries to move forward, Yuki’s memory remains an emotional anchor in his life.

Shizusumi Yagi
Hiragi and Shizusumi have known each other since childhood and were bandmates alongside Yuki. Over time, their relationship deepened, and they are confirmed to be dating. Despite Shizusumi’s reserved personality, the two maintain a strong emotional connection, offering each other quiet support.

Mafuyu Satō
Hiragi and Mafuyu were classmates prior to the events of Given and share a complicated connection through Yuki. Hiragi is aware of the emotional weight Mafuyu carries and shows a mixture of concern and distance in their interactions, particularly when Yuki’s past resurfaces. Their dynamic is shaped by shared grief and unspoken understanding.