Why the quotation marks? Either it's going to be a harem or it isn't. Please clarify.
I'm guessing because Harem has a generally applied term of "guy gets a girl and they all love and live with him" kind of vibe. I have a feeling that in this game, MC will get all the girls, but it's not the traditional way.
Funny enough, in Manga/Anime/Visual Novels the term Harem was a blanket term that Rumiko Takahashi (Inuyasha, Ranma) basically invented with her manga Urusei Yatsura. In the traditional sense, it's not about MC getting with all girls, rather that all the girls are generally in love or will end up falling for him. Even in Visual Novels since EVERY game has Love Interest that MC can win over, it's no longer important to classify the game as Harem. And even when there IS a Harem route, it's usually a small bonus if you've cleared ALL the endings.
It's only recently in Western VN's that the definition is "We get ALL the girls in the end and MC and girls live on an island married and pregant!" So yeah, weird tag.