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Although the conflict between Oni and Monks had come to an end, a rather peaceful and unexpected one, the conflict between Frank's forces and the organization behind this which had also employed Shinji into everything wasn't over yet!
Indeed!
Frank learned everything by seeing Shinji's soul memories, and so did Sadako when she ate his soul and got his memories, alongside a sudden new affinity with Spatial Magic!
"So that bastard was paid by Chaos Gate?! I can't believe it… And I saw him as such a loyal subordinate…" sighed Sadako.
"You were quite deceived…" said Frank.
"I know… I can't believe how stupid I've been…" said Sadako.
"Well, it wasn't just that. He had used a special tool to make his lies more believable, well, the artifact was already destroyed." Said Frank.
Check "The Protagnist's Sister Is Actually the Strongest"!