Myu-Myu
From Serial Experiments Lain wiki
Taro's girlfriend. They are often seen at Cyberia along with Masayuki. She becomes jealous when she witnesses Taro's advances on Lain in Layers 03 and 09.
Trivia
As the opening menu screen of the PSX game loads with the LIF Network Operating System, you can see a message in the lower left hand corner of the screen that reads, "special thanks: myu-myu."