It's, well, complicated and the sole guide I have found is in Chinese and not that helpful without much editing and testing for getting things right (for reference,
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).
What you / we will primarily want are trainings required to unlock other as well as conditions for special endings.
For now, all I can say is that two things are important: Taking it slow (Progress can be stopped by using the Globe) and not doing always training since events may happen at 5/5 in the evening or even on other days.
