Comes with exclusive product code of stigma "Factor Analyze". Product code is valid through June 22, 2018 0:00 - Jan.1, 2038 0:00 (JST / UTC+9). See sealed page for details. No matter how many books are purchased, only one item can be obtained per account. Product code may not be valid outside of Japan. Requires the game software of either the package ver. of downloaded ver, to receive bonus item.