He really is good at meddling at peoples lives. Was basically all he did for the past year.
But Ryo and An did an awesome job to let them meet again as adults. All the way back to smoothly forcing Chizuru to accept the job at ReLife to the final blow on the welcoming party with that "coincidental reencounter".
I suppose u could say was the power of love, but at the same time the drug didnt work properly if they remembered each other. I felt tricked. After all, that was the most sad part of the whole story.