Yuta Sakurai is a boy with a kind-hearted personality who loves animals. After losing his father, he comes to live with his mother's parents, but is surprised by how rural the place is, which is very different from the Tokyo he used to live in. And his mother, who he relies on, is busy with her job as a nurse, so she isn't home much. In order to relieve his loneliness, he enters his veterinarian grandfather's veterinary clinic without permission, but his grandfather finds out and gets angry at him. Yuta then runs away and heads into the forest. There, they find a baby squirrel-like animal...!? Animal diary drawn by Hiroyuki Kikuta