Yuki Aachen is a member of the 104th Scout Regiment along with Eren, Jean, Mikasa, and the rest. After being enlisted, she meets the guy who does maintenance on all of the 3DMG and helps design new models, Hiiro Takada. And of course, everybody knows Levi! After an accident, Takada is eventually promoted to Captain, equal in rank with Levi, and Yuki finds herself drawn closer to both of them - but which Captain should she try to catch?