Niina no Ero Youbi: Shuumatsu wa Himitsu ni Tou-ch (Niina's Erotic Days: Secret Touches on the Weekend). Genre: An adult "touching" simulation or visual novel.
Without specific context, it's challenging to provide a definitive explanation for the phrase. However, it's possible that "Niina no Ero Youbi Shuumatsu wa Himitsu ni Touc Install" refers to a particular adult-oriented software, application, or online service. This service may allow users to access or interact with adult content in a way that's described as a "secret touch install."
To install Niina no Ero Youbi ~Shuumatsu wa Himitsu ni Touch!~
: Frequently assigned to the Enter or P key to speed through previously read dialogue.