From Chibi Manga:
The JK Nako spends so much of her time in idle amusement that her grades are dropping. So as punishment, she is forced to spend her summer holidays at a temple! She thought it was going to the worst summer holiday ever but her instructor, the vice priest Ikkei-san is a super ikemen!?

He's stubborn and strict but he's also kind and reliable at the same time. This sort of Ikkei-san is so attractive that she keeps getting drawn to him! A JK who is full of troubles x a stubborn priest, a romance of a summer is starting