OVA
Description
Masaomi Asahina, eldest of the Asahina brothers, was born on April 24, stands 179 cm tall, and possesses blood type O. He practices as a pediatrician, channeling his gentle, child-loving nature into his medical specialty. To soothe young patients, he habitually carries toys and sweets like the bunny plush "Usa-tan." Despite his medical training, he developed a severe blood phobia during university after a traumatic practice surgery, causing him to faint upon exposure. This phobia partly motivated his pediatrics career—minimizing blood encounters while addressing a specialist shortage—alongside a desire to support his family after his father's death, believing medicine would provide stability and relieve his mother's burdens.

Following their father's passing, Masaomi assumed a paternal role within the household. He shares profound closeness with youngest brother Wataru, whom he frequently cares for and dubs "the apple of his eye" alongside Ema. His dynamic with second brother Ukyo remains less intimate but cooperative, as both manage domestic duties. Generally laid-back, Masaomi spends leisure time relaxing at home and seldom exhibits anger, though when provoked, his demeanor shifts to uncharacteristic intensity.

Romantic feelings for stepsister Ema create conflict with his self-perceived guardian role. He initially conceals this affection due to an inferiority complex, valuing himself only for medical expertise until Ema affirms his worth as the family's protector. Acknowledging his love explicitly disrupts his paternal dynamic with her; he rejects being "like a father" to her as incompatible. In game narratives, he marries Ema, and they anticipate a child. The anime depicts him persisting in romantic rivalry, refusing to abandon his feelings. Novel lore notes his refusal of an arranged marriage to honor his commitment to Ema.

His evolution involves overcoming self-doubt through Ema's influence, transitioning from viewing himself as a mere caregiver to embracing his role as the family's emotional anchor. Defining moments include confessing his feelings, his unwavering pursuit in the anime's love triangle, and his game-route marriage and impending fatherhood, collectively underscoring his dedication to familial stability and growth beyond professional identity.