With harem you mean a relationship with multiple girls right?, so yes there is it, as spoiler he's on a relation with a woman and after something happens, he start one with the daughter of the woman; a free demo of the v0.3a is on this page, but this month there's also a demo of the v0.4 (two above the v0.3a) on this link Derketo Games Frebbies by DerketoGames (itch.io), the free game on the page changes every month, is done this way to continue bringing free demos of the games available here; also if you like the harem thing you may have look at this one: "Derketo Lewd Housemates by DerketoGames (itch.io)", it has much more harem than this one.
I almost forget it, yes the games story will have an ending after the story is completed, but now are "on development", on the format of chapters - episodes, on this game we are on the chapter 1, episode 5 (6 on reality if you count 3pt1 & 3pt2), the games get updates every month, see you.