I mean, I hate being harsh on something that is free. But this is another koikatsu VN attempt to rekindle the spirit of Lessons in Love or other similar games (although Lessons in Love is a high bar, this does not come close). It also uses models in screenshots sourced from Koikatsu, although it lacks the animated sex scenes that most Koikatsu games have. It runs in unity instead of Ren'py, because the developer decided to remake the entire engine from scratch for a really undercooked JRPG sequence a third of the way through the game, which is never revisited or expanded upon. Unfortunately the JRPG sequence is the only part of the game that is animated, and it really has amazing animation, but it lasts only a few seconds and is never revisited and feels completely removed from what is otherwise essentially a very linear visual novel. There is an "explore the world" sandbox element that is thrust upon you once in a while, but it's only there to allow you to miss some minors scenes or content and/or skip some expository dialogue as there is no branching story, decision making, or gameplay.
The choice to go with unity instead of Renpy means that the game is missing tons of the quality of life/convenience features you might expect from a visual novel of this size. The decision to animate the ONLY fight in the entire game when none of the sex sequences are animated, repeatable, or available in a gallery, goes to show that this game really is an experimentation by the creators instead of something they have approached with a concrete plan to produce something quality.
Unfortunately, the story and characters are also poorly designed and written, although if you find yourself impressed with Dragon Ball Z, 50 Shades of Grey, or Pokemon fanfiction, you may find the writing compelling. The story begins very clearly tongue in cheek in a comedic harem style, but quickly drops that tone in favor of attempting to make you feel some connection to cardboard characters who primarily seem to cry in an attempt to get you to empathize with them before having progressive sex sequences where a group of women join you in discovering extremely convoluted and virtually nonsensical "lore" of a fantasy/science fiction setting that seems to have been made as the game progressed without much of a common thread other than justifying very cheaply that your harem have some deep spiritual connection to you and that's why they are okay with all doing various sex acts with you.
I can't help but think that the developers would have done a better job if they decided to commit to making a visual novel that is comedic. The elements of other styles of play detract from to the experience, undercooked as they are. The writing drastically falls off the face of the earth after the prologue when the game shifts from the comedic to the "serious," as the writer is neither skilled at world building or at creating believable characters that you can feel actual empathy towards. The fap quality is not very high, as there are no animations and there is hours of content to wade through for a few still sex scenes with no gallery, although they aren't bad as at least they are posed well and made with good koikatsu models.