Upon entering Doshisha University, Yasunari Tsuru initially shows a cold attitude toward Natsusa Yuzuki, ignoring him during their first interaction despite Natsusa’s attempt to greet him. When Natsusa mentioned watching recordings of the team’s games during his absence, Yasunari dismissed his comments and rejected any advice, especially from him, before distancing himself.

As the story progresses, circumstances lead Yasunari and Natsusa to become roommates, a situation Yasunari initially finds uncomfortable and awkward. During a match, Yasunari becomes distracted when facing an opponent who greatly admired Natsusa, causing him to lose focus on the game. Following the incident, the team captain warns him that his place on the roster may be in jeopardy if his performance does not improve.

Later, Natsusa approaches Yasunari to point out his flaws and provide constructive advice. Although embarrassed by his earlier behavior, Yasunari begins to acknowledge his mistakes and, with Natsusa’s guidance, works to improve both his mindset and his abilities as a player.

Yasunari Tsuru is a young man with a lean, athletic build that reflects his training as a rugby player. He has short, tousled red hair and striking blue eyes, which make him stand out among his teammates. A small but noticeable detail of his design is the sharp, straightforward expression he often carries, emphasizing his reserved and occasionally standoffish personality.

On the field, Tsuru wears the Doshisha University rugby uniform. His jersey is long-sleeved with alternating blue and magenta stripes that stop just above the wrists, and he plays under the number 11 as a left wing back. Off the field, his casual attire typically includes denim blue jeans paired with a long yellow belt that hangs from the right side of his waist, adding a touch of individuality to his style. He completes his look with white sneakers decorated with red sides and a thin yellow stripe around the ankles.

Yasunari Tsuru is portrayed as both energetic and shy, combining a playful charm with a reserved nature. While he enjoys the game and has the skills to be an outstanding rugby player, his lack of self-confidence often prevents him from fully recognizing or embracing his abilities. This self-doubt makes him sensitive to criticism and hesitant to take advice, particularly when it comes from those he views as rivals.

At first glance, Yasunari may seem aloof or unfriendly, as he tends to keep his emotions guarded and sometimes responds curtly to others. However, beneath this exterior, he is a kind-hearted and considerate individual who values his teammates deeply. Over time, his caring nature becomes more apparent, especially as he begins to accept guidance and support from Natsusa Yuzuki and others.

His personality is further defined by his personal growth throughout the story. Initially resistant to teamwork and hesitant to confront his own insecurities, Yasunari gradually learns to rely on others, develop trust, and build confidence in his role. This balance between his shy vulnerability and underlying warmth makes him both relatable and central to the team’s evolving dynamic.

Natsusa Yuzuki
Yasunari initially has a strained relationship with Natsusa, often dismissing him and refusing his advice. Their dynamic is tense at first, especially when circumstances force them to become roommates, which Yasunari finds uncomfortable. Over time, however, Natsusa’s persistence and constructive guidance help Yasunari confront his insecurities and grow as both a person and a player. Through this, Yasunari begins to acknowledge Natsusa’s support and develops respect for him.

Seiichirou Shingyouji
Although less directly involved in Yasunari’s development, Seiichirou provides a connection point between Yasunari and Natsusa, sharing game footage that later sparks one of their early confrontations.

Teammates
Yasunari’s relationship with the rest of the Doshisha University rugby team is shaped by his performance on the field. His struggles with focus and confidence draw concern from the captain, who warns him that his place in the lineup may be at risk if he does not improve. Despite these tensions, Yasunari ultimately benefits from the team environment, learning to accept feedback and contribute more effectively.

• The given name Yasunari (靖也) is composed of yasu (靖), meaning “peaceful” or “calm,” and nari (也), which can mean “to be” or “also.” Together, the name can be interpreted as “peaceful being” or “one who is calm.”
• His surname Tsuru (都留) combines tsu (都), meaning “capital” or “metropolis,” with ru (留), meaning “to detain,” “fasten,” or “halt.”