ɪn tˈuː θˈaʊzənd sˈɛvən, hiː wʌzɐ ɡˈɛst vˈoʊkəl ˌɔn kˈaɪ jˌɑːʃɪhˈiəɹoʊz tˈɛn stˈoːɹiz ˈælbəm wˌɪtʃ dˈɪd ɐ kˈʌvɚ sˈɔŋ ʌv ænd ɐpˈɪɹd æz ɐ sˈiːkɹᵻt ɡˈɛst æt ɡˈoʊldən sˈɜːkəl vˈɑːl.tˈɛn ˌɔn ˈeɪpɹəl ˈeɪt ænd nˈaɪn.
In 2007, he was a guest vocal on Kai Yoshihiro's 10 Stories album which did a cover song of  and appeared as a secret guest at Golden Circle Vol.10 on April 8 and 9.