Zenryoku Usagi are hardworking construction builders, who happen to be rabbits, guided by a simple motto: “Zenryoku+Dai-ichi” (“Give everything you've got and be #1”). The animated shorts aired in Japan as part of the Chibi Ani Gekijou (Tiny Anime Theater) program on Friday or Saturday mornings, depending on the station. Ikeda and Media Factory have produced two books and a wide range of spin‑off merchandise featuring the characters.