Untill someone proves me wrong, the penultimate chapter will be about Yuuki turning into an invincible god of war made of all the skills poured into him, and the final chapter will be an orgy as reward.
@FallenAngel
The gap between the time leap and current time seems to be shrinking, probably the climax will be when both time leapers realize that there's no turning back.
If the figure is the detective, I'm curious about his whole posture in the totality of the case, he predicted that another of the quintet would disappear as if it were the most natural thing on earth.