Yuuki Irie

As the brilliant younger sibling of Naoki Irie, this clever student shares his brother's impressive intellect. He initially spends his time relentlessly teasing Kotoko, finding amusement in poking fun at her antics. However, as his feelings evolve, he gradually learns to embrace her presence in his life. Although he develops a genuine acceptance for her, he maintains his mischievous persona by continuing to playfully bully her.