Maki Goto
Yasuda and Ichii sang a particularly catchy duet known as "Otome no Shinrigaku" (Girl's Psychology) on Morning Musume's second album. In response to the popularity, Tsunku decided to group them together with the third generation member, Maki Goto to create the Morning Musume subgroup Petitmoni (also known as Pucchimoni) in 1999. Their first single, "Chokotto Love," sold over a million copies.