Some people have lovingly crafted some guides to help effectively play through and get all the endings. Of course, it is advised you play through the game with no cheats or guides before consulting these, if you haven't already. If there are any more guides, you can let me know. Thanks to you who have spent time to do these. :3
Short mention of endings, cheats, where to see all the cutscenes, and a long guide about where to work on each day to get bonuses.
kitschy-chiroptera on Tumblr [link]
Cheats, answers for the personality quiz at the beginning of the game, and specific information about getting each ending.