Levi Ackerman, a twenty six year old tea shop owner, is granted temporary custody of his four month old cousin Mikasa.

Captain, Isa, and Big Brother are part of a popular band called, "Underground Friends Outside," yet those names were their stage names. Captain's real name is Levi Ackerman, who worked hard to protect his secret identity. Isa was Isabel Magnolia's stage name, and Big Brother's real name was Farlan Church. But upon examining popular albums, the band realized they either need to work harder to produce better songs, or they retire. Thankfully during one of those concerts, Levi found his inspiration from the crowd. A woman, of course.