[kj1980]

Originally Posted by Rias

I might missed a critical point in Saikoroshi-hen or something, but...

Spoiler:

The reason why Hanyuu can't enter the world is that Rika's mother is still alive (and she being the real reincarnation of oyashirosama), right? However, recall that Rika has claimed that "everytime when the world starts again, Hanyuu is always there to tell me about the world". That might work for all the worlds, but what about Himatsubushi-hen? That took place while dam war was still going on, and her parents were still alive...

Spoiler:

The reason that Hanyuu gave that she couldn't come into the Saikoroshi-hen world was not because Rika's parents were alive, but it was because in that world, Rika's mother was the eighth decendant - not Rika.