Izumi, a 12-year-old schoolgirl, suddenly gets not one but two lovely and rather lewd maids from outer space, who have to defend her city from a monster's invasion.

St Marris Academy is a facility training youma-hunters. Within their ranks are 3 elite students, Hikaru, Seira, and Yuki. A fierce battle unfolds when the youma Balmus invades the campus. However, the three are defeated when they are attacked by Kotone, a teacher at the Academy subjugated by the youma.

The Aoi siblings, Aki and Sora, are as close as a brother and sister can be. But as Sora enters high school, he realizes that his feelings for his older sister go beyond simple family ties. Oblivious to her sibling's affair, Sora's twin sister Nami attempts to get her best friend to go out with him. And unbeknownst to either of them, Nami harbors a deep and jealous lust of her own. Aki-Sora is a love story, for sure, but whose love will be returned? Whose love goes unrequited? Can the bond between brother and sister be strengthened by romance, or will Aki's and Sora's affection drive them apart?

Kashou Minaduki, the son of a long line of Japanese confection makers moved out to open his own shop "La Soleil" as a patisserie. But upon moving out, hidden amongst his things were two of the catgirls, Chocola and Vanilla, that the family had been raising. When he tried to send them back, they begged and pleaded until he gave in and now they've opened La Soleil together. With two catgirls who really, REALLY love their master trying their very best and occasionally failing -- a heartful comedy opens for business!