[Von Himmel]

^

Spoiler:

He probably understands that by leaving his feelings in Moon behind to T.K will probably makes T.K not having coma since he will never attacks Kagari because of that emotion.

I personally think that what Kotarou did was just leaving that message that he wants to meet Kagari again and Moon Kagari then planned the events based on that. Because he wants to meet her again, Kotarou experienced an event where he went through many difficulties and in turn transform to what happened in the end, where he can use his ability to travel to the moon. Though he could also planned the knowledge leak method and then Kagari sees that as something that will eventually gives future to humanity