Ayumi and her friends are all just entering the eighth grade, as, one by one, they discover that love is infectious and you can catch it from anyone! Now Ayumi's torn between two brothers, Koyoi has an altogether different kind of brother issue and budding theatrical impresario Sumire seems ready to do anything to land her leading man. Then there's tom-boy Rika, aspiring artist Nao, Kei, who's very 'mature' for her age and older girl Misaki who really IS more mature.

Kaito Kuroba is a normal teenage student whom loves being a magician and showing off to his classmates. His father dies in an accident 8 years prior and later finds out it was because of his fathers double life. Kaito finds out his father was a famous international criminal known as Kaitou Kid the Phantom Thief and that he was murdered by a mysterious organization for refusing to aid them in retrieving the "Pandora Gem”. He vows to prevent the organization from gaining the gem and assumes his father's secret identity as kaitou kid.

Cecily's a blushing knight in shining armor. Unfortunately, it seems most battles end with her as the damsel in distress. Her lack of skill and distaste for violence make her an unlikely heroine - until the brooding blacksmith Luke comes to her aid, using his powerful magic to forge blades of supernatural strength. Cecily wields this sacred steel and charges forth to face a dangerous new threat. A cloaked fiend is unleashing demons upon the land, and though he lurks in shadows, the villain is much closer than Cecily can imagine.

Squid Girl has come to the land from the depths of the sea to conquer humanity in revenge for pollution of the ocean. Unfortunately she ruins the first house she uses as an invasion base and has to work to pay for repairs. Of course, she can't overcome the Aizawa sisters who manage the house, so who knows whether she can subjugate humankind.