Sensei wa Koi wo Oshierarenai?Honestly, she chose the best option, reminds me of that manga about the teacher and the high school student.
Best age-gap romance of all timeSensei wa Koi wo Oshierarenai?
"Sweet days with a boy" is really good too. If you like this you'd probably like that. Also "living in an abandoned bus" and "our solo camp" oh, and "Smoking at the back of a supermarket"Best age-gap romance of all time