Rakujitsu no Pathos落日のパトス; Sunset of Passion; 落日的激情

What happens when next door to upcoming mangaka Fujiwara moves Yuuki, who was his teacher back in high school and first crush? Yuuki, now a married woman, is starting a new life in the city, however her husband is always away on business trips. She finds comfort in the company of her former student, but what she doesn't realize is that Fujiwara can listen to everything happening in her apartment through the building's thin walls