Yukihiro Aida is a 16‑year‑old male high school student at Shiyonoya High School, a basketball club member, and a classmate of Mari Asaka and Tsunagu Hidaka.
He plays the role of an upbeat, fair‑minded friend who helps bridge the gap between humans and beastfolk in the story.
Name: Yukihiro Aida
Gender: Male
Age: 16
School: Shiyonoya High School
Year: High school student, same class as Mari Asaka and Tsunagu Hidaka
Club: Basketball Club
Occupation/Role: Student, supporting protagonist
Voice Actor (CV): Koutarou Nishiyama
Yukihiro is described as a cheerful, energetic, and friendly young man who cannot ignore anyone in trouble.
He has a strong sense of fairness and approaches others without prejudice, even when society around him is biased.
He is not good at studying and academics, but he loves physical education and sports, making him an active, athletic type.
Despite his easygoing side, he is responsible and considerate of others’ feelings.
At home, Yukihiro is a caring big brother who reliably looks after his younger brothers.
He is also a surprisingly good cook, adding a gentle, domestic side to his otherwise sporty image.
Yukihiro’s daily life changes when Tsunagu Hidaka, a beastfolk boy who has lived a completely different life from humans, transfers into his class.
While many humans discriminate against beastfolk, Yukihiro accepts Tsunagu from the very beginning with no prejudice at all.
He casually protects Tsunagu when classmates tease or bully him, stepping in and admonishing those who are making fun of him.
His actions show that he is not just friendly but willing to stand up against unfair treatment.
Yukihiro quickly becomes close to both Tsunagu and Mari Asaka, spending time with them so that they can all open up to each other.
He proposes various ideas and makes efforts to help their classmates accept Tsunagu as part of the class community.
Over time, Yukihiro and Tsunagu become relaxed, no‑holds‑barred best friends.
They respect each other deeply and can speak their minds freely without walking on eggshells.
With Tsunagu Hidaka
Yukihiro is one of the first humans at school to welcome Tsunagu Hidaka, a beastfolk boy who suffers discrimination from other humans.
He does not treat Tsunagu as an outsider and instead stands by him naturally, sometimes shielding him from hurtful behavior.
He gently but firmly calls out classmates who mock or bully Tsunagu.
Through this, he becomes both Tsunagu’s emotional support and a key figure in changing class dynamics.
As they spend time together, Yukihiro and Tsunagu form a close, mutual friendship based on trust and respect.
They become the kind of friends who can honestly criticize each other, joke around, and still know they have each other’s backs.
With Mari Asaka
Mari Asaka is Yukihiro’s classmate, and he gradually becomes attracted to her.
However, he keeps these romantic feelings hidden rather than openly confessing to her.
Yukihiro is aware that Tsunagu is also strongly drawn to Mari.
Instead of competing, he chooses to support Tsunagu, taking actions that effectively push Tsunagu forward and encourage his relationship with Mari.
At the same time, he helps Tsunagu face a delicate problem: Tsunagu struggles to control his sexual desire toward Mari.
Yukihiro stands by Tsunagu and works together with him to confront and manage this issue, treating it seriously rather than mocking or avoiding it.
With Kisara
Kisara is Tsunagu Hidaka’s childhood friend and someone who has long been in love with Tsunagu.
She experiences heartbreak when her feelings for Tsunagu do not work out.
After her unrequited love for Tsunagu ends in failure, Kisara begins to interact with Yukihiro.
Through their growing contact and shared experiences, they gradually become attracted to each other.
Their relationship develops slowly and naturally, as two people who were once on the sidelines of someone else’s love story start to find new feelings together.
With His Family
Although not deeply detailed, Yukihiro is known to take good care of his younger brothers, who are still quite young.
He fulfills the role of a reliable older brother, handling childcare tasks and everyday responsibilities.
His ability to cook well ties into this family role, as he is capable in the kitchen and likely helps with meals.
This side of him contrasts nicely with his sporty, not‑so‑studious school persona, showing that he is dependable both at home and with friends.
Yukihiro’s standout talents lean more toward physical and social abilities than academics.
He excels in sports and physical activities and is an active member of the basketball club.
He struggles with studying and is not academically inclined, which sometimes sets him apart from more studious classmates.
However, his athleticism, energy, and social warmth make him a central presence in class life.
He is also skilled at cooking and is comfortable handling household tasks for his younger siblings.
This combination of athletic skill, domestic ability, and emotional intelligence makes him a well‑rounded and appealing character.
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