Plus-Tech Squeeze Box was formed in 1997 and has two members: Tomonari Hayashibe (keyboards, programming, etc.) and Takeshi Wakiya (guitar, bass, etc.). Their sound goes from pico pop to shibuya kei to some rock and electro. Their first album, FAKEVOX, (2000) had vocals by Kamada Junko.
Their second album was released in 2004 called CARTOOM!, however Kamada Junko had left the band at that point.
Apparently this was one of the more famous pico pop/shibuya kei groups as their music appeared in commercials for Coca-Cola, Powerade and were featuring on the Spongebob Squarepants movie, the BBC, Pucca and DDR. They have also done a lot of collaborations including with capsule and Strawberry Machine.