true ending :
5 things you need to do after you can get to the map(dun need to follow the order):
a. read 10(?) times for learning. you can check the progress at home - status
b. work at night.
(select it at home will -2 affection, but do it in library will -1 only. however it doesnt matter, it will minus 70~90 affection in the way to true ending. and affection is required for happy ending only, doesnt affect any other things at all.)
until you can read other books. those 2 h scenes in library isnt required either.
c. buy the $600 yugioh thing.
d. collect clues. there are too many of em so i wont write it here, not all are needed, i think 10 is enough. (maybe this is useless.)
e. rest in park at morning ($100 -90 tireness, since 100 tiredness will make you down already.) until the nun show up, the choice doesnt make big diff either, choose leave will just make you cant go back to park in that day, dun leave is best option anyway. church will be unlocked no matter what you choose. then go to the church 2 times.
after you done b. c. e. (not necessary to follow this order as well but this should be how it work usually.) rest in park until clown event occurs. follow the hint and go to store to get the knife. after that, if your language is good enough, visit the church 3rd time will let you stab the 'girl' and get the true end.
side notes: only the 1st ($300?) and those 2 $1000 hv functions. all other stuff, clothes you can buy and lust are for daily repeatable h scenes only. since the first and last clothes bring you easy clues so its recommended.