Osananajimi wa Itsumo Sakibashiru

While Haruta is living a miserable life, his childhood friend Sakuraba Yui, who sped off down the glittering road, has returned home after several years, divorced!? Yui's eyes, as she looks down at Haruta through the window, exude a mature allure, and Haruta has been drawn to her all this time...!? A revenge romantic comedy for a virgin boy!

(Source: Shonen Gahosha, translated)