Shinseki Nokotowo Tomari Dakara 3 Top -
Assuming the phrase is Japanese romanization with minor misspellings, interpret it as:
Possibly a fan translation of Itazura Kiss: Cousin Chapter or something from the Shinseki no Koto ga Ki ni Natte series.
If you typed “shinseki nokotowo tomari dakara 3 top” into Google, try these corrected searches instead:
On English sites, search: “VN with three heroines cousin sleepover”