幸福指数 (Koufuku Shisuu)

==Background==
"Koufuku Shisuu" is 40mP's third doujin album. It contains tracks sung by GUMI and Hatsune Miku. Featured is one of 40mP's best known hits, "Shiryoku Kensa". Mastering for the album was done by Signal-P. It was first released at THE VOC@LOID M@STER 20.
==Preceding and succeeding albums==
40mp chiisana jibun to oukina sekai.jpg|Chiisana Jibun to Oukina Sekai
Exit tunes presents 40mP.jpg|Shintai Sokutei
==Track listing==
==External links==
===Official===
===Unofficial===
Category:Albums
Category:Japanese albums
Category:Albums featuring GUMI
Category:Albums featuring Hatsune Miku