Goro Arashiyama is a life guard at the beach where the Lemon Beach House is. He is an old friend of the Aizawa siblings, and even has a crush on Chizuru. He can't refuse a request made by Chizuru, even though he hesitated when she asked him to attack her with everything he had when she was helping Ayumi Tokita learn self-defense, and he refused to stop helping, causing him to end up in the hospital. He went so far as to jog with Chizuru, finding that she had only jogged half of her usual distance, whereas he was about to collapse. He made it to the building he lives in, but didn't make it up the stairs. He collapsed right on them, passed out.