Valkyrie Connect has just released a Hololive collaboration event and has already announced a second Hololive collab will follow.
valkyrie connect
Valkyrie Connect Launches Bleach Collaboration Event
Valkyrie Connect is currently having a collaboration event with the anime Bleach. The event will end July 14th. You can get Rukia Kuchiki for free by clearing the story event. More details can be seen here.