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|Seiyuu||None (Manga-only character.)|
Tominaga Kisaki is a supporting female character in the Hiyokoi manga series. She does not appear in the anime special. She is Hirose Yuushin's childhood friend and neighbor, and were very close until she confessed to him. However, it seems like he rejected her. Despite that, they continued being friends — just not as close. Later in the series she moves to the U.K.
Kisaki is very beautiful, with long, silky hair and kind eyes, When standing next to Yuushin, they seem to look like celebrities. She is almost as tall as Yuushin and has model-like looks.
Kisaki is shown to be kind and mature, even to Nishiyama Hiyori, who she knows like Yuushin. She even gives advice to Hiyori that she should be more outgoing if she wants to attract Yuushin. She is shown to have a short person complex and envies short people like Hiyori; this is most probably due to her great height.
Hirose Yuushin (広瀬結心): They are childhood friends as they used to live next door to each other. After she confessed (and was rejected), they remained friends but not as close. She later gets over Yuushin and supports Hiyori in her love for him.
Nishiyama Hiyori (西山ひより): She is honest with Hiyori and envies her height. After getting over Yuushin, she supports Hiyori in her goal to confess to Yuushin. This is seen when she sends Hiyori a postcard which tells Hiyori to become closer to Yuushin, as he may be taken by someone else if she doesn't. Hiyori admires her confidence and beauty.