I found no guide to this game (amazingly, there's usually always at least one blog out there with a guide), so I'm trying to get them myself, but I'd at least like some notion of what I'm going for so I can better know how to search for it, so could the dev or someone else that knows tell me which endings are there?

I assume there's one ending for each boy, which makes 5, and I already got 2 other endings, an "alone" kinda ending where you're just tell Marlain how you don't regret coming to the school anyway because important stuff happened, and the coach ending. Which are the other 4?