Arashi manages Kurage no Shokudou, his coastal restaurant. He rescues a young man, Youtarou Misaki, after finding him washed ashore and near drowning. Despite Youtarou falsely claiming amnesia, Arashi provides temporary shelter and care at the restaurant, continuing this refuge even after learning of the deception—consistent with his pattern of aiding those in distress.

He maintains a stoic demeanor, seldom showing emotion or smiling. This emotional reserve connects to significant personal loss: the death of his brother from jellyfish syndrome, a hereditary condition Arashi also bears. This condition implies an underlying burden shaping his guarded nature. His friendship with Natsuko and protective actions toward Youtarou reveal a capacity for forming bonds, particularly intergenerational connections with younger individuals despite being in his thirties.

His background carries profound grief over his brother's death. A jellyfish tank in the restaurant holds potential symbolic significance related to this loss. Interacting with Youtarou, an anguished surviving twin processing his own trauma, prompts Arashi to begin confronting unresolved feelings about his brother's passing. The narrative establishes his initial emotional state and motivations rooted in loss and responsibility, concluding at a point suggesting the start of a healing process.