Summer Wars, Accel World Recommendations
Both anime contains sci-fi themes involving the virtual world as well as elements of comedy, action, and romance.
Both anime presents a game like setting where avatars are present inside and involved in conflicts. Additionally, the main protagonist forms a bond with the female protagonist.
Also, there is a mysterious atmosphere like feeling that goes beyond the walls of the virtual world and the real world.
They both deal with an "online" community. However, Accel World is darker in nature and more of a "game" while Summer Wars is a bit more cheerful and more of a provider for different life needs... gps, shopping, etc.