"Big Brother?" Chitose looked up at Itsuki
Seeing his little sister, Itsuki smiled.
"Are you okay, Chitose?"
In the Shadow Ritual ending on the FF2 remake, Itsuki's in his cell with a crimson butterfly. Do we know who this crimson butterfly is yet? It can't be Mutsuki. Mutsuki never became a butterfly.
No and definitely not Mutsuki.
It may just be a crimson butterfly random.