Koshiro is a great bear of a man with a rarely-shaven beard, who works for a marriage-arranging company. Though he initially comes off as an insular, gruff man verging on unintentional boorishness, it is more accurate to say that he is someone who feels subtle and powerful emotions, but lacks the eloquence to express them. His natural protectiveness of Nanoka wars with his strong attraction to her and his sexual frustration since his breakup, and he is often brusque with her as a result

Saeki Koushirou works as a wedding planner, but his own love life is a shambles. His background makes it difficult for him to commit himself wholeheartedly to love. The child of a divorced couple, he lives with his father. He has a mother and a sister, but he has not seen them in years. After being dumped by his girlfriend, a chance encounter with a female high school student shakes Koushirou's calm and awakens new feelings in him - but he learns that the girl is in fact his sister, who will now be staying with his father and him. Yet, the feelings in Koushirou's heart... 
(Source: Anime News Network)

__Hometown:__ Riverside, California

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Between voice acting, script-adapting, and directing, Patrick Seitz has had the pleasure of working on hundreds of different video games and anime series over the past 20 years. His voice credits include Endeavor MHA, Franky One Piece, Dio JoJo’s Bizarre Adventure, plus a variety of video game voices like Arthas Menethil and Garrosh Hellscream from World of Warcraft. Seitz’s script-adapting credits include the English dubs of the animated feature films Summer Wars and Wolf Children, as well as series such as Aggretsuko, and he has directed a bevy of Japanese RPGs.

_Source: Crunchyroll Expo 2020_

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Born twelve years apart, siblings Koshiro and Nanoka were separated when their parents divorced and moved to different parts of Japan; as a result, they both grew up hardly aware of the other's existence. 
The story begins when 15-year-old Nanoka moves to Tokyo to live with her father and brother, the latter being 27 years old and employed by a marriage-arranging company. Koshiro first encounters Nanoka on the train one morning, and returns her dropped train pass. Despite their age difference, they feel a brief spark of connection before they go their separate ways. 
Soon after that, they encounter each other once again near an amusement park, where they go on an impromptu date. While riding the Ferris wheel, the two open their hearts to each other and discuss their recent romantic woes. Nanoka comforts Koshiro when he breaks down and cries, and he realizes that he is very attracted to her. Right after the date, they meet their father, and are startled to realize they are siblings. 
Koi Kaze is about Koshiro's love for Nanoka, his conflicting drive to obey societal norms, and Nanoka's growth into womanhood and her growing feelings for her brother. 
(Source: Wikipedia)

Koshiro Saeki