Kazuto is the owner of a bathhouse which he is trying to run in part to honor his late grandfather who loved the bathhouse. He is one of the few that actually likes the idea as his parents refer to it as a "money pit" and think him a fool to even try to run it. Though somewhat stubborn in running what many believe to be an outdated and failing business, he is considered to be a kind and hard-working soul, which eventually impresses and endears all those around him, including the Valhallan Royal Family. He is nearly killed in Valkyrie's crash landing but saved when she gives him half her soul. He also seems drawn to her in a way and finds himself falling in love with her, but unsure with how to deal with her childlike appearance at times. Eventually, he does see beyond her childlike appearance and loves the Valkyrie within. He plans to marry the princess... eventually, and is recognized as her official fiance.