No premiere date or PV yet. Check out the Crunchyroll article for more information. Synopsis of the source light novels from AniList:
One day, a gamer played video games until he fell asleep…and when he woke up, he found himself in the game world–as a skeleton! Equipped with the powerful weapons and armor of his avatar but stuck with its frightening skeletal appearance, Arc has to find a place for himself in this new, fantastical land. All his hopes for a quiet life are dashed when he crosses paths with a beautiful elven warrior, setting him on a journey full of conflict and adventure.
Oh yeah. It starts out very dark and then it’s all sunshine and laughter afterwards. Makes you wonder why they dropped to that tone in the first place.