After a period of hesitation, he was eventually convinced by the encouragement of both Shiina and bassist Seiji Kameda, who is said to have told him "Hurry up and join so we can play together", and Izawa debuted later the same year as a member of Tokyo Jihen's Phase 2 lineup alongside new guitarist Ryousuke Nagaoka, nicknamed Ukigumo.
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After graduating from Kurashiki's Seiryo Senior High School, he entered the composers' program at the Kunitachi College of Music; however, he left the college two years later without graduating because he felt he would not be able to study and compose music seriously at the same time.