SPOILER SO DON’T READ IF U DON’T WANT SPOILERS.
I just skimmed the Russian translation cause the English is taking forever to release. But it seems the MC gets a happy ending, where they all get out of the school and he ends up with a harem with all the girls at the end. I’m not sure if they start living with him at the end or just slept over to have the group orgy (they might’ve started living with him and the last page was all the girls leaving to their jobs since each girl is successful in a career or something). But I’m not sure. All I know is the MC gets all the girls at the end to be submissive girls in his harem. He’s happy, girls are happy, and they are all free from the school. So I guess that’s a W ending. If someone understands Russian and wants to explain what happened, go on ahead.