Rikka

What do an alien, a rogue ninja, a girl with superpowers, and a disguised boy have in common? They're all friends hiding as 8th graders at an all-girls school. Though none of them are aware of each other's secret, their lies keep their friendship tight. If this wild bunch isn't enough, their classroom is in danger of being destroyed...oh and Earth too! Source: Crunchyroll

A high school senior named Youtarou thought he was an only child — until he met his real mother and discovered that she has 19 daughters, from 0 to 18 years old. Now he ends up living with his true family. Note: The Blu-ray version of the anime features stereoscopic 3D. The DVD version features regular 2D footage with the title changed to Baby Princess 2D Paradise Love.