Momoyama Kyoudai

The Momoyama family is known for their exceptional children: Natsumi, the graceful school nurse; Haruki, the celebrated author; Arima, the outgoing and athletic twin; and Chihiro, his more reserved counterpart. Since they were ten years old, the twins have carried a secret burden. Their parents once mentioned revealing "the truth" when they turned sixteen, leading both siblings to wonder about their origins. Chihiro, with her quiet demeanor and ordinary appearance, often worries she might be the one who doesn't truly belong. Despite these uncertainties, the twins share an unbreakable bond. Arima's constant support and promise to always be there for Chihiro, regardless of their blood ties, has been her anchor through the years. As their sixteenth birthday approaches, the siblings must prepare themselves for whatever revelations await them—ones that may challenge their understanding of family, identity, and the connections that bind them together.