「Kōfukuron (幸福論) – Ringo Sheena」Wiki
"Kōfukuron" (幸福論 lit.The theory of happiness?) is the debut single by Japanese singer Ringo Sheena and it was released on May 27, 1998 by Toshiba EMI, East World. Since Sheena suddenly gained popularity, it was decided that this single was resold as a 12 cm single. New edition, including the new song, was re-released with the fourth single "Honnō" on October 27, 1999. The 1999 edition was certified gold by the RIAJ for 200,000 copies shipped to stores.
(Wikipedia contributors. "Kōfukuron." Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 3 May. 2014. Web. 29 May. 2014.)