Miku Nakano (Credits to Kiotaro)

Miku is a silent and reserved girl who has a pessimistic way of thinking and at the same time has little confidence, even to the point of despising herself. Fuutarou points out that Miku has no faith in herself. Contrary to her reserved self, she can speak in a direct manner and does not hesitate to confront others. Miku has an obsession with generals from the Sengoku period. She is greatly influenced by his philosophies, to the point of affecting her behavior in real life. Miku hides this fact from everyone and is embarrassed when Fuutarou finds out. Among the generals of Sengoku, the one Miku likes the most is Takeda Shingen. This is hinted at many times throughout the series. Set the Takeda logo as your phone wallpaper. He often quotes the verses of Fūrinkazan, which was the war flag used by Takeda Shingen. When Fuutarou challenged Miku to a duel of historical knowledge, Miku is portrayed wearing armor identical to Takeda Shingen's. Despite her slightly negative outlook on life, such as when Miku asks Fuutarou to abandon her, she is the first sister to fulfill the Go-toubun Principle. Miku always reminds herself to follow this principle, going so far as to compromise her own self-interest to ensure that everyone is treated equally. According to Fuutarou, each Nakano quintuplet has its own characteristics regarding its leaves. In Miku's case, she has good handwriting.