Aida ni Hatachi

Overview

In the summer of his third-year of high school, 18-year-old Takae Reika was struggling with preparations for his university entrance exams when he ran into a beautiful 38-year-old woman Misa-san. Reika fell in love at first sight with Misa, who had just had broken up with her boyfriend, and he pretended to be his 25-year old brother to hide their true age difference. But he did not know that Misa-san also had a secret of her own.... A love comedy featuring a 20-year age difference, between an 18-year old high school boy and a 38-year old unmarried woman, that all started with a lie! Includes an omake.

Source: AniList