Three adorable triangular objects descend from space. Calling themselves the Triangle Brothers, they take the form of a child and a cat and begin living on Earth. Noba, who usually assists alien tourists, reluctantly finds herself responsible for their care. Furthermore, a meteorite is approaching Earth… This is a "sci-fi slice-of-life manga" about the energetic Triangle Brothers and the weary adults of outer space. Both volumes of the collected edition include newly drawn manga.