Botan Ichige dreamt of nothing but enjoying a tea party with celestial maidens. Accompanied by her best friend, Shinobu Itoko, she joins the St. Asmaria All-Girls School with hopes of realizing her fanciful desire. As luck would have it, one day an angel named Un appears and offers her halo to the girls to consume. However, the repercussions of their indulgence in the halo lead Botan and Shinobu to exhibit a risqué behavior, giving birth to multi-colored, mushroom-shaped objects that leave Botan feeling uneasy. Un promises to grant Botan's wish only after she lays one hundred thousand "eggs." With this promise, Botan becomes determined to make her fantasy a reality, embarking on an arduous mission to achieve her ultimate goal.