Saitou Shouichi

Saitou Shoichi is a player in Alfheim Online. In Material Edition 3, he confesses his love to Yui, before stating he'll be retiring from the game soon.

Yui, baffled, ends up hacking the server for his IRL address and goes with Asuna to find him. They eventually find out that he was an old man who passed away several days earlier in May.