alphashizuo

Sora and Shiro are a pair of siblings, brother and sister, who are well known as brilliant. Yet they are NEETs - useless to society, and (Not in Education, Employment, or Training) - and even worse they are completely house-locked shut-ins (hikikomori!

Kagome Higurashi, a normal 15-year-old girl, falls down a dry well--and finds herself in the feudal past, 50 years after her ancestress Kikyo imprisoned the half-human/half-demon Inu-Yasha. As the reincarnation of Kikyo, Kagome possesses a magic jewel that greatly increases the power of demons.

Yukiteru "Yuki" Amano is a loner who spends most of his time writing a diary on his cell phone or talking with his imaginary friends Deus Ex Machina, the God of Time and Space; and Murmur, Deus' servant. One day, Deus gives Yuki a special diary, mentioning something about a game.