Two boys discover the same piano from opposite sides of shame: one playing in secret because his mother's work makes him invisible, the other suffocating under a family legacy that demands perfection. The show never frames their music as escape or redemption, it's just what happens when two people who aren't allowed to be broken sit at the same keys. Listen to how they play differently. That difference is the whole story.

Kai, whose mother is a prostitute, has played an abandoned piano in the woods near his home since he was small. Shuuhei grows up in a household of renowned pianists, with a famous pianist for a father, and the instrument has been part of his life from the start. The two boys come from very different worlds, but a chance meeting brings them together, and their shared bond with the piano begins to reshape both their lives and their music. This quiet drama is built around music and the connection it creates between them.