"Your Akechi learned how to change hearts?"

Something Ren thinks of is the look on Akechi's face back when Morgana told him about changing hearts, and how it worked. At the time, he thought it was part of the act, but... now, he's not so sure.

Would it have helped him? To find a way out from Shido's thumb?

"And you've been at it for a while... Interesting. Way different from my world, I can say that much. If you don't mind sharing, what led to it?"