Honestly I'd prefer if there wasn't a harm tag. I wouldn't mind this just being the story of these two working to survive together in the island. Eventide introducing other characters would be fine, but I'm so tired of harems.
Especially for a more personal character-driven story like this. I hope at worst this is a more pseudo-harem where maybe other girls show up and crush on the MC, but it's still clear he's just going to get with Anastasia. Idk just my personal preference.