[ Ren snickers at the Kitagawa impression, but the next revelation brings him up short yet again. ]

—Wait, Akechi's friend Kasumi Yoshizawa? He said something about a dead sister. So Kasumi herself is the sister who died in your world?

[ It doesn't immediately occur to him that it could be true in his world as well, after everything Akechi's been saying about bizarre changes in cognition in the world he comes from. ]