Hayato Oda (織田 隼人, Oda Hayato)
Oda is a handsome, young man with bushy brown hair, and sparkling brown eyes. His left eye is accompanied with a beauty mark just beneath it. He is almost always seen wearing a smile, and is very energetic. At first glance, many would believe that he may be a relative of Sunakawa's, however they have no relation at all.
Oda is a very energetic, and always has a smile on his face. He is madly in love with Sunakawa's older sister, Ai. He was easily deceived with the thought that Suna was Takeo, however the situation was solved when Takeo showed up in his work clothes. He only went to the restaurant to confront Takeo about Ai's feelings towards Takeo. However, he was soon dragged out by Ai and was forced to head back to his hometown (which he did not).
Nothing of his childhood or family is explained in the anime, so nothing is known.
He appeared in only episodes 13 and 14, but has not appeared in the anime after their vacation to the amusement park. He is a supporting character, so there is not much to say.
He has a crush on her. The two both attend the same university and Hayato has always been irresponsible and tried to get on the teachers' good sides so he could get away with coming to class late and turning assignments in late. However, once he accidentally lost some papers his teacher entrusted to him and while others pitied him, Ai berated him, saying it was his fault for being irresponsible. However, right afterwards, she helped find his papers and apologized to him for yelling at him and also shared half the blame for losing the papers, telling the teacher it was partially her fault. Her sense of responsibility, maturity, and kindess caused him to fall for her. He is aware of her crush on Takeo and tried to help her confess her feelings to him by setting up a double date with Takeo and Yamato with them and separating Takeo and Yamato so Ai could have Takeo to herself. Ai had a great time with Takeo but ultimately decided to keep their relationship the same and not confess. While annoyed with Hayato and his attempts to get to know Takeo and get her to confess her feelings for him, she is grateful for the chance. She is still somewhat annoyed at his attempts to get her to return his affections since he can be a little pushy.