While everyone's connecting Kirihara Yukito with Kirito, the only characters come to my mind when seeing his face on the cover, is Kazehaya Kamito. Not only they both come fron the same author(but different series), their thought process and action is pretty similiar. Let's say Kamito have Restia, then on the same comparable, Yukito have Sana.
This manga is fine till you realize if the MC gets the slightest cut he dies the end, therefore causing a plot armor so thick he never even gets hurt (unless we're using D&D rules and/or the author unceremoniously cuts to black the end)
In before it's really just some friends who made a campaign to help him grieve the loss of his sister