I'll try not to spoil the game too much so I will just use generic examples.
There will be 3 types of endings.
Bad : You end up alone. Either because all the girls left you, or maybe because you didn't had any path open.
One girl : In the end you are only with a girl. Those are the most romantic ones and specials for the girl. To reach this type of ending you either focus the whole game on a certain girl or maybe the other girls you have focused on, left you because they felt betrayed by you, or maybe because they didn't like the girls you cheated her on with.
Part harem: This will be the most common one. By the end some girls will find out about each other, but they will accept to share the MC, however not all the girls are compatible with each other. Some girls will accept to share the mc with certain girls, but not with others.