Nao Kiyomiya (清宮尚, Kiyomiya Nao) is a supporting character in the Sekai-ichi Hatsukoi series. He was Ritsu Onodera's high school roommate when Ritsu studied abroad.
Nao has dark hair and light eyes. He is close to Takano's height.
Nao is friendly at least when around Ritsu and loves taking pictures. He enjoys teasing Ritsu by telling embarrassing stories about him from high school and also commenting that Ritsu had always been a slob. However, he is also protective and sympathetic to what Ritsu went through. He quickly picked up on the fact that Takano was actually Ritsu's high school crush and became extremely hostile towards him.
Nao and Ritsu were roommates in high school after Ritsu left Japan to study abroad. Ritsu was a mess after his breakup with Masamune Saga, and Nao helped him get back on his feet. The two became close friends, although nothing happened between them.
Nao and Ritsu run into each other at Marukawa Publishing when Nao is working on getting a book of his photography published. The two start to catch up, and they exchange business cards to keep in touch since Ritsu needs to get to a meeting.
That evening, Nao calls Ritsu and asks to crash at his place since he's only in the area for a short time, and Ritsu agrees. Nao comes over and teases Ritsu about having a messy apartment, saying he hasn't changed at all. Then Takano comes over, since he had plans on having dinner with Ritsu. The three eat as Nao and Ritsu catch up. During the conversation, Nao suddenly asks Takano if he knows why Ritsu went to study abroad, unknown to him that this is a tense subject for the two. Nao goes on to tell Takano how gloomy Ritsu was after his breakup. Ritsu tries to get him and Takano to stop, but Takano wants to hear more about Ritsu's "melancholy student life," and Ritsu half-slips that it's Takano's fault.
Ritsu leaves to get a bath ready, leaving Nao and Takano to talk. Nao goes on about Ritsu and what a "scumbag" his ex was, saying it was pretty clear that the guy was only ever using him, which angers Takano. Nao then asks about his name, guessing that he's actually "Masamune Saga." Nao digs into Takano more, distrustful of him after what Ritsu already went through because of him.
Ritsu comes back from preparing a bath, but they've talked so long that it's time for Nao to catch his train. Nao takes a picture of Ritsu to commemorate their reunion before going.