meltzar

Rintaro Okabe is a self-proclaimed "mad scientist" who believes that an international scientific organization named SERN is conspiring to reshape the world according to its own interests. He and his friend Itaru Hashida inadvertently create a gadget able to send messages to the past.

Takuma Sakamoto is a hikikomori gamer who is mysteriously transported to the world of his favourite MMORPG, Cross Reverie, with the appearance of his own character in the game, the Demon Lord Diablo. The two young girls who summoned him, the pantherian Rem and the elf Shera, attempt to use a spell to make Takuma their servant, but due to his passive "Magic Reflection" ability, the spell rebounds, and both end up with magic collars stuck on their necks, thus becoming his slaves instead.

The story follows Rico, an orphan who dreams of becoming a great cave raider, much like her mother, and solve the mystery of the Abyss. The Abyss is an unexplored enormous cave system inhabited by strange and wonderful creatures, along with mysterious artifacts.

(Also known as Ore no Imouto ga Konna ni Kawaii Wake ga Nai) For several years, Kyousuke's relationship with his younger sister Kirino has been cold, to the point that they only share greetings. But one day, Kyousuke finds a moe anime DVD fallen in their entry hall.

Sometimes the relationship between a brother and sister just doesn't work out very well. Oreimo is about two a brother and his sister, Kousaka Kyousuke and Kousaka Kirino.