The title seems to be Japanese and can be broken down into parts:
Let’s break down the phrase into digestible parts:
Thus, the implied meaning could be:
“Because I’m staying overnight with my relative’s child – Vahana Exclusive version.”
This suggests a narrative-driven game or manga where a sleepover with a younger relative leads to a dramatic turning point, and the “Exclusive” denotes bonus content, alternate endings, or collector’s items. shinseki no ko to o tomari dakara de vahana exclusive
You (protagonist) invite your second cousin, Minori, for a weekend sleepover (o-tomari). But Minori secretly belongs to a forgotten priestess bloodline. When she falls asleep inside your family’s old shrine storehouse, she unconsciously summons Vahana – divine vehicles from Hindu/Buddhist cosmology – into your living room.
Exclusive to this event:
Shinseki no Ko to O Tomari Dakara de Vahana Exclusive Pick-Up Summon