Tora Morisaki

He lived with his father until he married Rin's mom, Miyu. He hates the smell of smoke because he remembers his mom as smoking. Because of this, he carries around a water gun that looks like a gun. He at first believes that Miyu took his dad away from him and is against the marriage but softens up a bit. As soon as he realized it he bluntly told Rin he loved her.