An anthology comic of Choujigen Game Neptune by various mangaka.
A slice-of-life story about 'life-less' Brother and sister, both jobless shut-ins. from http://karashicolor.blog91.fc2.com/
From MangaBox: Mai Yashiro (22) was an average office worker until the day a video game console arrived in her mailbox. The game she is forced to play, “Nightmare,” is a dangerous game in which one risks both the lives of the ones they love and their own body!! If you refuse to play, those dear to you die. If you lose battles in the game, parts of your body (your arms or legs, your voice, etc.) cease functioning. The horror of this game spreads throughout society in a flash, and, to fight it, Mai’s company creates a “Nightmare” Strategy Team. After being assigned to this team, Mai and her dependable comrades boldly rise up against this hellish game. Adapted from the super-popular novel which has received over 40,000,000 hits online!!
Shiori was once a guitarist in a light music club in high school. But her first live performance was dashed when her brother ran away from home with a lot of debt, to become a musician in Tokyo. A decade later, Shiori is now a high school teacher, leading a boring, uneventful life and paying off the debt… till she runs into the ghost of none other than a famous guitarist Jim-you-know-who. A story of a 27-year-old woman on her way to a music legend begins here.
Taken From Viz Media: A gate to another dimension has burst open, and from it emerge gigantic invincible creatures that threaten all of humanity. Earth's only defense is a mysterious group of warriors who have co-opted the alien technology in order to fight back!