Yes and no. You start off with shit stats, but you keep your stats every loop. With high enough stats, you can be #1 ranked in a given subject or semester, and being ranked #1 in a semester gives you the right to bunk with the love interest, which should be very impressed with you by your academics and agree to be your girlfriend (and sleep with you) at that point anyhow. With a high enough combat rank, you can also beat up dudes bullying her, which will give you sizeable affection points too. As a plus, raising her affection also gives you its own currency for buying potions.
The only issue is, the love interest's affection for everyone except the MC is also retained, as well as her sexual interests/experience. For the good endings, you're on a race against time to knock her up to marry her, and optionally be her first sex partner. It's honestly perfectly doable on normal mode, but you better haul ass and make your move before an NPC hits 500 (realistically, you want to make your move before 450) affection. If you haven't fallen into the pitfall trap of trying to grind money, you should have no problems doing so. You can technically buy an upgrade and reload the save to make it free, since upgrades are shared across all saves, but you only really need the starting affection upgrade, which is relatively cheap.
You should know though, NTR is not completely avoidable. As long as affection is low and you haven't fed her any weird potions (exhibition/lewd is fine if you're her BF), the worse that happens in the first semester is maybe some oral action. However, there's a possibly unavoidable gangbang in the third semester, though the game tells you if love interest has to participate at the start of said semester iirc. If you're gunning that loop for real, you have to commit. By the time you hit the ending (end of 3rd semester), a few NPCs would likely have hit 500 affection, making any subsequent loops pretty much guaranteed NTR runs.