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|Hair Color||Light Brown|
|Eye Color||Reddish Brown|
|Status||High School Freshman|
|Relatives||Tomoe Yagami (older brother)|
|Affiliations||Honan Stride Club|
|Japanese Voice||Ryohei Kimura|
|English Voice||Austin Tindle|
Riku Yagami (八神 陸, Yagami Riku) is the first titular hero of the series. He is a first year student at Honan Academy and is one of the stride club's runners, predominantly a leadoff runner. He is voiced by Ryohei Kimura (Japanese) and Austin Tindle (English).
Riku is a handsome young man with slender build and messy, pale brown hair and reddish-brown eyes. He usually ties it up in a high ponytail with bangs and some strands hanging out from the back.
He wears a white jersey (with a thick blue and thin red line running across the shoulders until the elbows and Honan Academy's emblem on the left) with a red t-shirt underneath. He wears it with short black leggings, white track shorts, socks and white running shoes.
His school uniform consists of the black school gakuran which contains both jacket and pants, that has a slightly unbuttoned white dress shirt underneath and a red vest. He also wears white-red sneakers.
Riku has a bright and cheerful personality and is able to become friends with anybody. He is very athletic and has good motor skills but only has average cardiovascular fitness. Due to his superior athleticism, Riku has been recruited for several other clubs (specifically basketball, volleyball and table tennis) in the school, more for his speed and agility rather than his ball skills. Riku's older brother, Tomoe, was a member of the Stride club previously, and was studying in America before joining Kakyoin, but he had quit Stride before because he is nowhere near as talented as Tomoe (and later Takeru). The Yagami family runs a bakery, which happened to be Asuma and Reiji's favourite. He falls for Nana on the first day of school in the visual novel, but in the anime it seems like he doesn't have any romantic interest in her.
In episode 11, it is revealed that Takeru, Riku and Nana actually met 7 years ago in 2010 in primary school, but they all changed so much in appearance that they forgot over time. At the time, Riku was a better runner than Takeru. He also wanted to run against Tomoe despite not being an anchor.
He has great acceleration and poor parkour skills because while he can jump and hurdle, he can never land safely. He also has average stamina and poor slope skills, as Asuma of Saisei retook the lead in the downhill section, and in the second race, he ran too hard and lost the lead in the twisty and sloping tunnel against Takeshi Eifuku. He also lost the lead against Tetsu Hachiya in the third race in the longer-than-expected opening section where Hachiya dodged Yagami's attempt of a block, and almost collapsed before the transition.
He also has poor flexibility, something Takeru suspected, but never confirmed until he saw him struggling with stretches with Asuma during summer camp. Asuma also pointed out that his hunched posture meant he cannot take in as much oxygen if he was more upright, causing his stamina to drop in longer runs.
By episode 10, his stamina has improved, but because he is caught up with trying to match Takeru and Tomoe he mentally ran into a wall. Technically, his breathing technique was noted to be incorrect, and his upper body is unstable. By episode 11, his mental game has improved so remarkably that he wanted to run as an anchor against Tomoe, which Takeru and Kyosuke gave their full support.
- Likes: Japanese Soba Bread, red meat and seafood, walking and almost all sports.
- Dislikes: Kabaddi, running in the rain, something his older brother loves doing, which is partly why he resisted joining Stride Club, and that he wanted to join three other indoor sports clubs at the same time instead.
- The voice actor of Riku, Ryohei Kimura, has also voiced Kōtaro Bokuto (Haikyū) and Ryōta Kise (Kuroko's Basketball).
- While Riku and Takeru both have poor grades compared to Ayumu, they have basic knowledge of science when they point out that just because Ayumu has green hair, he can't perform photosynthesis.
|Honan||Riku Yagami • Takeru Fujiwara • Hozumi Kohinata • Heath Hasekura • Kyosuke Kuga • Ayumu Kadowaki|
Yujiro Dan • Riko Kawarazaki
|Saisei||Reiji Suwa • Shizuma Mayuzumi • Bantaro Chiyomatsu • Tasuku Senoo • Asuma Mayuzumi|
|Mihashi||Kei Kamoda • Yu Kamoda • Aoi Shima • Hisato Harigaya • Takeshi Eifuku • Nobuhiko Nagatsuka|
|Ichijyokan||Yuri Himemiya • Shiki Dozono • Kaoru Shishibara • Kiyoto Washimi • Arata Samejima • Tetsu Hachiya|
|Kakyoin||Tomoe Yagami • Amatsu Ida • Toya Natsunagi • Nanpei Aoba • Hajime Izumino • Ryo Izumino|
|Others||Joe Sakurai • Koichi Takahara • Sakura-chan • Kamon Kurobe • Diane Hasekura • Shauna Hasekura|
Katsuji Yamane • Kohinata Siblings