Ah! My Goddess Ah! My Goddess Episode 13 Ah! Who Does Onee-sama Belong to? ( Air Date 2005-04-07 ) Genre Animation, Comedy, Drama category. Overview "Skuld's been spending a lot of time with Belldandy, but Belldandy still wants to go to school with Keiichi. Skuld decides to take apart Keiichi's bike, but ends up upgrading it. Megumi notices the upgrades and starts to critique it. This upsets Skuld, who issues Megumi a mechanic's challenge. At the suggestion of Keiichi's senpais, Skuld and Megumi enter a robot battle contest to settle their conflicts.".