Imagine a mansion with a Christmas goods shop that appears out of nowhere, housing three beautiful sisters and a robot maid, all with very different personalities and figures. These sisters are looking for information that they can only acquire from "popotan," their term for dandelion flowers. After acquiring a hint of this information, the mansion and the girls vanish. Their travels take them through many places, and they meet a varied cast of characters during their quest, but what exactly is this information they're searching for so desperately?
Deep in the mountains lies a library with the same name as one of its caretakers, Kokoro. With her sisters Inna and Aruto, she strives to uphold the best characteristic of a librarian -- to help users with all her heart. Join young Kokoro as she starts the journey to become a full-fledged librarian, while learning about life, and being the best she can be.
Without warning, a giant alien bell suddenly appeared over the skies of Tokyo. Its purpose, it broadcast, was to take over the Earth, a plan which so far has not been thwarted. Luckily for humanity, the Magic Users Club of Kitanohashi High School is here to save the day! Armed with 2 new recruits and a load of magical talent, Takakura, Aburatsubo, and the rest of the gang begin to train daily for the goal of defeating the bell, and finally earning the respect of the Mizuha Miyama manga club, their largest rival!
She cooks, she cleans, and is a lethal fighting machine. Mahoromatic, former Vesper battle android, has chosen to give up her weapons, extending her remaining life from 37 to 398 days. As Misato Suguru's maid, she fights battles of another sort, fending off an amorous teacher on one hand, ecchi magazines on the other. Can Mahoro save Suguru's innocence?
Tragedy struck Kotaro Higuchi as a child in the form of his mother's death in a car accident. But fate has a funny way of doing things, and years after the fact an angel-in-training named Misha decides to pay him a visit. Joined by his fellow elementary school students, and later by the nicest demon you'll ever meet, Kotaro and Misha will embark on a journey of laughs and love.
In the present, the Japanese government has been conducting experiments to genetically engineer a human: a girl named Rizel. The experiment was a success -- sort of. While healthy and cheerful, 12-year-old Rizel also ended up possessing the uncanny need for “love” to further her development, as well as tears which were in fact volitile explosives! When sadness can end up destroying a city block, what's a girl to do except... get married?! For Iwari Tomori, the young man chosen as the most appropriate partner for Rizel, life is about to change, for better or for worse!
Both series are filled with fan service and have a comedic air to them, and they both in some way play to the lolicon audience (more so in Rizelmine than in Popotan). Also, both have a somewhat touching storyline that is fairly enjoyable. I'm sure that if you liked watching one, you'll like watching the other.