Mikito Nemu

Pair of twin sisters the protagonist encountered at the campsite.
They are beginners and only know the basics of camping thanks to the internet and videos they've watched. Due to this and despite having wonderful tools, they don't know how set up tents, start fires or cook properly.
The protagonist finds them as they're fighting, and he advices them to do things surely but steadily. As they become better campers thanks to the protagonist, they start admiring and falling in love with him.