In May 2007, Yasu started his solo project Acid black cherry. With his first single Spell magic he landed at number 4 in the Oricon Single Charts in Japan. The second single Black Cherry followed on September 26, 2007 and the third single Aishitenai 愛 し て な い on November 28, 2007 . The fourth single Fuyu no maboroshi 冬 の 幻 was released in 2008.
The first album BLACK LIST was released on February 20, 2008. Two guest musicians came to support this album: Daita (ex-member of Siam Shade fame ) on guitar and Jun-Ji (also ex-member of Siam Shade fame ) on drums. On August 27, 2008, ABC released their fifth single, 20+ ∞Century boys, and on November 19, 2008, their sixth single, Jigsaw ジ グ ソ ー , was released and reached # 3 in Japan's Top 50 Songs. The seventh single Nemurihime 眠 り 姫 followed on February 18, 2009. Yasashii uso 優 し い 嘘, the eighth single, came out on July 29, 2009. The second album QED was released on August 26, 2009. A story about this album was published on the official website of Acid Black Cherry. This story is about a murder case and the search for the murderer. In 2010 the ninth single Re: birth came out. The song was used as the opening for Another Century's Episode: R game .