
It could be that Mikey from the future keeps coming back to the past to make sure he ends up becoming as he is in the future. And mikey telling takemitchy about that dark impulse is probably since he has memories of making ugly decisions but doesn't have reasons/consiousness of why he does them or probably because some things happen and he remember how/have memories of it. After all we have no idea of how the past takemitchy handles what has happened after the future one returns back to the future. And Mikey in the future probably realises that takemitchy changed the past since his present (which is the future) changes so he goes back to change it again. I dont know the reasons or anything. And its just a theory.
Anyone who reads this and understands. Major respect!

my thoughts as well. assuming mikey also goes back in time just as takemitchy shakes naoto's hand, he probably had no idea why it was happening and goes with the flow, constantly reliving all the terror but not being able to fully comprehend the phenomenon. this is shown when hina exposes takemitchy's secret at the hospital. if i recall, mikey's not the least bit shocked unlike draken who despite is just as grieved over emma. we could say that was the scene where mikey fully understood why he kept going back to time. and that takemitchy was the key to everything.
THE MOVIE THEY WATCH AT CHAPTER SIX
is To Take an Enemy's heart! THAT WAS SO BEAUTIFUL (づ ̄ ³ ̄)づ
Really!? I didn’t notice now I have to go back and see