>>40023661They would be sisters even without the lore. It's pretty normal to expect relatively high profile vtubers designed by the same artist to at least acknowledge each other sometimes. Like, Ike recently collabed with two of his siblings who aren't even in Nijisanji.
>or why Rosemi and Petra never collabsUsed to be asked all the time and even more so for Selen and the rest of Obsydia.
