He is best known for creating the 2D fighting game series, Guilty Gear. He designed the characters and storyline, and wrote the music. He also provides the in-game voice for the characters Sol Badguy and Order-Sol, as well as Freed Velez in Battle Fantasia. Ishiwatari worked with Arc System works on the first Guilty Gear as soon as he left school. Recently, Daisuke, along with Yoshihiro Kusano, also wrote the music for BlazBlue. More recently, Ishiwatari composed for Hard Corps: Uprising. Queen is known as his favorite band.