Amaji, Gorou

甘字五郎

From Wikipedia:
Kakeru's classmate and friend. Kakeru nicknamed him Gigolo, though he was far from being a ladies' man. His friends often forget him because of his lack of Existence. He also has a crush on Yurika Kochikaze, but he always ends up unable to tell her or gets ignored. However, he is a reliable person in times of need, always ready to help his friend.