High-school siblings Rei Hayakawa and Shiori Hayakawa live what seems like a perfect life—wealthy, talented, and bound by a close, caring relationship. Despite their differences, they share a quiet understanding and genuine affection, supporting each other like any normal brother and sister.
But everything changes when their mother delivers an unexpected ultimatum: from now on, only one of them will be recognized as the true heir of the Hayakawa family—the one who proves superior in academics, achievements, and every competitive aspect of school life.
Reluctantly, their peaceful bond turns into a silent rivalry.
Rei, a calm and musically gifted student, finds solace in the school’s music club alongside his friends Reina Kisaragi, Miyu Takasugi, and Yuna Takahashi. Meanwhile, the observant and composed Shiori is a member in the school’s radio and announcement room, subtly influencing the flow of information across campus.
Though neither truly wishes to compete, both are driven by pride, expectations, and the desire to prove themselves. As their rivalry intensifies, small victories and quiet sacrifices begin to test their relationship—blurring the line between love and competition.
In a story filled with comedy, romance, drama, and emotional tension, one question remains:
Can they defeat each other… without losing what matters most?