Last Story wa Anata e.

One winter day main character logs in to Hypersense Network's cyber shopping mall to buy new memory. It is the so-called “Cyber ​​Akihabara”. As soon as he punts in his ID and starts walking on the main street, his protocol is hijacked and screen distorts with poisonous colors. This illusion feels like a real Akihabara even though the weight of mouse and just bought memory can be felt in hands.
With a lightning strike electronic machine starts to act up, and protagonist finds himself dragged into a dream-like twilight world.

[From vndbreview]