Aya Arisugawa ( 有栖川 綾, Arisugawa Aya) Voiced by: Sumire Uesaka [7] (Japanese); Erika Harlacher [9] (English) Nasa's classmate and a complete airhead, she has explicit feelings for Nasa. On a snowy winter night, Nasa Yuzaki, a boy who was made fun of during his childhood because of his peculiar name, encounters a beautiful girl after he received his practice exam grades for high school. However, the girl saves him, and Nasa miraculously follows her at a bus stop and proceeds to confess his love for her. On May 9, 2023, Viz Media launched their Viz Manga digital manga service, with the series' chapters receiving simultaneous English publication in North America as they are released in Japan. With the apartment lacking a bathtub, Tsukasa and Nasa head out to a bathhouse after having breakfast.

After she marries Nasa, she begins showing new parts of herself, such as her massive love for movies and manga. Fly Me to the Moon is written and illustrated by Kenjiro Hata, the author of the manga series Hayate the Combat Butler. She accepts his proposal on one condition: marriage, to which Nasa gladly accepts before passing out from his injuries.

A fanbook, titled Tonikaku Kawaii Kekkon Kingenshū ( トニカクカワイイ公式ファンブック 結婚金言集), was released on December 18, 2020.

Aurora ( アウロラ) Voiced by: Yuki Nagaku [13] (Japanese); Michelle Rojas [14] (English) One of Chitose's maids. During their conversation the previous night, Enishi had thanked Tsukasa for saving Nasa’s life, and entrusted her to look after him. After breakfast, Tsukasa and Nasa go sightseeing in Nara, and one stop is the site of the former Heijō Palace. At the front desk, the old lady asks Nasa to escort her to her room, and along the way they run into Tsukasa, who knows the lady is Chitose's grandmother, Tokiko Tsukuyomi, since she was the signatory for the marriage registration. There, they eat takoyaki, meet Aya and Chitose at the goldfish scooping game, and pray at the shrine.Fortunately, it seems he’s on the right path, ranking first in the nation’s mock exams and set to enter his high school of choice. On December 19, 2020, it was announced that the series would receive an original video animation (OVA), which was released on August 18, 2021. Afterwards, Tsukasa and Nasa have dinner at the theme park's buffet restaurant, and they play a game to pick food for each other to determine if they know each other's likes. The new episode, titled "Seifuku", was originally scheduled to be streamed on Crunchyroll in Q3 2022, [83] but was delayed to November 22, 2022. Nasa tries to figure out where Tsukasa will sleep, since he has a twin-size bed only big enough for one person.