Aliens exist for sure.
Even a child knows it.
The world is protected by a group of aliens with special power.
Daichi lives in such a world.
He terribly got burned five years ago, but it's all cured and he now lives a peaceful life.
But one day, he meets one of the aliens and his life slightly changes...
He is forcibly appointed as to be an examiner of the next protector test.
There are also three girls who move to his school to take the test and one of them is his childhood friend.
He still doesn't know that there will be a big event, which will change his future, in the not too distant future...[From ErogeShop]


by Wikipedia

Erika Furudo (古戸 ヱリカ Furudo Erika?)
Voiced by: Natsuko Kuwatani
Erika is a young detective introduced in End of the Golden Witch.
A blue-haired girl estimated to be around the age of a middle school student, she is characterized as being highly intelligent and possessing an excellent memory.
She acts very polite in public, and shows an extreme interest in puzzles and mysteries.
In truth, she is ruthless and cunning, and only solves mysteries to boast her superiority towards those who execute them.
She does, however, possess a serious inferiority complex, and is prone to breaking down emotionally whenever things do not go her way.

Erika had been presumed lost at sea after falling off of a boat near Rokkenjima around the time of the murders.
By the time public interest about Erika's fate arose,
she was written into the stories of End and Dawn of the Golden Witch as having washed up on the shores of Rokkenjima
being taken in by the Ushiromiya family as a guest.
From a magical perspective, Erika was a piece added to the game board by Bernkastel, created in her (and Lambda's) own likeness, to serve as the game's detective and investigate the murders presented in the core arcs, interacting with characters from the meta-world to formulate her theories.


Even though this is a sequel to To-Love-Ru, all of our main characters make an appearance along with some new additions.
Rito continues to be caught in over the top uncensored ecchi scenarios.
The alien Deviluke sisters still use their unique abilities to grab Rito's love confession.
Nana and Momo have transferred into the school and meet Mea, who seems to be a worry free and joyful girl.
Momo in particular wants to share Rito and create a harem for him.
While scheming her plan, she confronts Golden Darkness also known as Yami.
They are interrupted by possessed students who begin to fight with abnormal strength.
Now the new plot line appears as a mysterious person who's in control of the students tests Yami's assassination skills.
Who is this new enemy?