Demons' Crest, Vol. 2 (light novel)

The latest VRMMORPG, Actual Magic, has sealed an entire class of sixth graders in a terrifying game of life or death. Countless dangers await eleven-year-old Yuuma and his friends. One of their classmates has been turned into a monster, and gargantuan beasts lurk around every corner. Their only hope? The demon Valac who has possessed Yuuma-s twin sister. Following Valac-s guidance, Yuuma and his party set out to save their missing friend, Nagi. But an unexpected encounter awaits them...