Baby Worldend

Iijima Yuuko is a 16-year-old, introverted high-school girl having trouble making friends with her classmates. Her only friend is her dog, Pochi. One day, as she's taken Pochi for a walk, she encounters Yamada, the #1 handsome guy in the class that all the girls adore. He asks her to come watch his concert at the summer fest. Yuuko goes to the concert all excited, without knowing Yamada's ulterior motives. As she experiences first hand the incurable cruelty of man, she makes the world's most atrocious wish upon the innumerable stars that cover the summer night sky. Pochi, on the other hand, has only one innocent wish: "If I were human, I could tell you that you're not alone..."

(Source: Batoto)

Included one-shot:
Volume 4: Gomibako wo Kettobase