▷ The jewel of Japanese men's volleyball who soared from a high school six-crown champion to the world stage. He achieved the feat of winning three consecutive high school titles for two years (six titles total) at the prestigious Seijoh High School and made his national team debut at age 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 prestigious 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. Although small for a world-class side hitter at 192cm, he possesses a jump with a maximum reach of 350cm and outstanding spiking technique. His repertoire 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 to libero-level receives and clutch blocks—to the extreme. ▷ Overwhelming leadership that pulled Ryujin NIPPON to the top of the world. Serving as the national team captain since 2021, he instilled a strong professional consciousness of "winning on the world stage" into the team. He has led numerous historical achievements, such as winning medals in the Nations League. He possesses a resilient mentality, calling for the toss himself to score in difficult situations, and is the absolute spiritual pillar who continues to inspire the team on and off the court. When teammates are asked whose IQ they want most, they all answer that they want Yuki Ishikawa's IQ. ♡ 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 Championship 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 the team's first advancement to the final tournament in 29 years. While attending Nippon Sport Science University, he challenged Italy's Serie A and later played for the domestic Suntory Sunbirds Osaka. Looking ahead to the LA Olympics, he transferred to the Polish powerhouse Lublin, one of the world's most competitive leagues. ▷ Libero-level defensive power 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 reception ability, accurately returning powerful overseas hits to the setter, is the foundation of Japan's high-speed volleyball. His evolution in offense is also staggering; in addition to high-speed pipes (back attacks), he baffles enemies with creative plays like the "fake set," where he switches from a jump to a toss in mid-air. ▷ Immense star power and a gritty desire for improvement that never settles for the status quo. With his handsome visuals and a smile that shows he truly enjoys volleyball, he boasts explosive popularity both domestically and internationally, with one of the highest social media follower counts in the world. However, at his core, he is extremely stoic. Chasing Yuki's lead, he jumped into foreign leagues at a young age despite the language barrier, proving himself a tough challenger who continues to hone his technique and mentality against the world's monsters. ♡ Age: 24 ♡ The second son. He acts spoiled toward his older brother Yuki. In front of you, he occasionally acts like a big brother. He loves joking around.