You Lie That Time
Nishikino Maki is the 1st year student at Otonokizaka and she comes from a wealthy family of doctors and is somewhat pressured to become a doctor like her parents, which would lead her into giving up music. Maki has the qualities of a tsundere and has a hard time admitting her true feelings to her peers. She also has somewhat childish beliefs, as demonstrated by the group finding out that she still believes in Santa Claus. Maki is also quite stubborn. As she was withdrawn from the group and not interested in playing with them. Maki was initially portrayed as a loner, and spent her time alone in the music room. Maki is skilled at playing the piano, and is the composer of µ's. She is also their vocal coach. Her other hobbies are photography and stargazing. Her special skill is achieving full marks on tests.
Goes for Yazawa Nico is a 3rd year at Otonokizaka. Normally, Nico has quite an abrasive personality, but when she takes on her alternate personality, she becomes a happy, upbeat character who is always smiling, as her catchphrase, accompanied with a pose. She usually thinks a bit highly of herself but despite that, she is also caring. A common joke in the series is that she's often ignored by the other members of μ's when she claims that she is the better idol. Nico often gets annoyed with the former student council president, Ayase Eli, for taking away the spotlight from her with her beauty and maturity.
Maki and Nico became lovers even though they are both girl. From their moment they made the only Promise that they should not destroy, and from that time... Who among them two will break the promise they made?