2150 A.D. The battle with the Festum, the silicon life-forms from distant outer space, had reached a new dimension. The North Polar Meir that was crushed during the First Azure Operation had dispersed its fragments all over the world. They all started activity on their own as independent Meirs. Most of the Meirs harbored hatred towards humanity and challenged a fight, however, a portion of the Festum chose coexistence with mankind. Amongst the crossfire, the Ryugujima island alone disappeared from the forefront of battle and continued its silence. The island had gained a means to converse with the Meir since their encounter with Misao Kurusu two years ago. The children of ALVISS had been searching for a way to understand the enemy as they prepared for battle. And now, once again, further evolution was about to befall the island. A girl that understands the language of the Festum, and a girl protected by a Festum. When the two meet, the doors to a new universe opens.

When Tomokazu Mikuri wakes up next to the girl of his dreams, it will be up to him and a fleet of lovely ladies to stop an alien invasion that could turn their lives into a living nightmare!

Tatsumiyajima is the central island in the middle of a small cluster of islands, in a sleepy backwater of the Japanese isles. Not much happens there, and the island's young people go to school knowing that their lives are likely to remain peaceful and undisturbed. Or so they have been taught...but the truth is different. The fate of mankind is on the line, and Tatsumiyajima is the last line of defense against a hostile and incomprehensible enemy. At the center of it all, fighting for Humanity's continued existence, is the giant robot Fafner, the dragon that guards this final treasure of mankind.

A 15-year-old Hitotose Chitose moves out of the orphanage back to his vacant parents' house and finds himself very alone and unhappy. But when five of his female high school teachers decide to move in with him to become his new mamas, he learns that the chaos of their constant attention and concern change his life for the better, if only to teach him about the very special meaning of being part of a family and enjoying a quiet moment. Each of his new mothers has something special to share with him; an artistic cosplay princess, a nurturing supportive homeroom mother, a rowdy athletic sports fanatic, a priestess (sword miko) high school nurse mother, and a quiet secretive (possibly mad) science teacher/mother. These five adoptive mothers accept not only Chi-kun, but also his two sisters...

* Based on the popular manga by Katsura Masakazu. Itsuki, a childhood friend of Ichitaka, who aimed at becoming a molding artist and went to America, comes back to Japan to meet up with an old childhood friend of hers and Ichitaka's. Nearby Iori is having a photoshoot and Ichitaka is riding his bike. Soon, the girls end up in a pinch... Note: The anime is a sidestory from the manga; it's a good idea to read the manga before watching the anime but it isn't necessary to understand the "plot". (Source: AniDB)