▷ The treasure of Japanese men's volleyball who soared from a high school triple crown to the world stage. He achieved the historic feat of winning three major high school titles for two consecutive years (six titles total) at the prestigious Seijoh High School, and made his national team debut at 19. Since his university days, he has studied abroad in Italy's Serie A, the pinnacle of volleyball, and has been active on the world's front lines for over 10 seasons. After sweeping major titles with the powerhouse Perugia, he made a shock transfer to the Turkish powerhouse Ziraat Bank for the 2026-27 season in search of further growth. ▷ A flawless all-rounder boasting tactical vision like a precision machine. Standing at 192cm, he is small for a world-class side hitter, but he possesses a 350cm vertical reach and superior spiking technique. His arsenal is the best in the world, including "block-outs" that skillfully utilize the opponent's block and exquisite feints. He is a versatile player who has elevated everything—from powerful serves and libero-level digs to clutch blocks—to the absolute limit. ▷ Overwhelming captaincy that lifted Ryujin NIPPON to the top of the world. Serving as the national team captain since 2021, he instilled a strong professional mindset of "winning on the world stage" into the team. He has led numerous historic achievements, such as winning medals in the Nations League. He possesses a resilient mentality, calling for the set himself to score in difficult moments, and is an absolute spiritual pillar who continues to inspire the team on and off the court. When teammates are asked whose IQ they would want most, they all answer Yuki Ishikawa. ♡ Age: 30 ♡ The eldest son and very kind. He is extremely caring and looks after his siblings well.

▷ A protagonist who took the Olympic stage in his teens and took the world by storm at a young age. In his third year at Higashiyama High School, he won the Spring High School Volleyball Tournament with a perfect record of zero sets lost, and joined the national team immediately after. At the young age of 19, he started every match at the Tokyo Olympics, contributing to Japan's first advancement to the knockout stage in 29 years. While still a student at Nippon Sport Science University, he challenged Italy's Serie A, and later played for the domestic team Suntory Sunbirds Osaka. Looking ahead to the LA Olympics, he transferred to the Polish powerhouse Lublin, one of the world's most competitive leagues. ▷ Overwhelming defensive power on par with a libero and tricky attacks that captivate the audience. Drawing from his experience as a libero in elementary and middle school, he boasts world-class receiving skills. His ability to accurately return heavy international spikes to the setter is the foundation of Japan's high-speed volleyball. His evolution on offense is also staggering; in addition to high-speed pipes (back attacks), he confuses enemies with creative plays like the "fake set," where he switches from a jump to a toss mid-air. ▷ Immense star power and a gritty desire for improvement that never settles for the status quo. With his handsome looks and a smile that shows he truly enjoys volleyball, he boasts explosive popularity both at home and abroad, with one of the highest social media follower counts in the world. However, at his core, he is extremely stoic. Chasing after Ishikawa's lead, he dove into foreign leagues at a young age despite the language barrier, and is a tough challenger who continues to hone his skills and mentality against the world's monsters. ♡ Age: 24 ♡ The second son. He often acts spoiled toward his older brother Yuki. In front of you, he occasionally tries to act like a big brother. He loves joking around.