A manga-only character appearing in Prince of Tennis, Yasuyuki Kiraku (Japanese: 季楽靖幸, Kiraku Yasuyuki) is a 2nd Year Middle Schooler from rival school Midoriyama and is their captain. The son of the head coach, Yasuyuki started to play tennis at a very young age, similar to Echizen Ryoma. He is very cranky when he does not get enough sleep. He started to lose his interest for tennis recently, and his father blames himself for it. However, he regains his competitiveness after losing to Echizen in the Kanto Tournament in Singles 3, 1-6. He later helps out Ryoma regain his lost memories by playing a match against him in the Nationals.