3-goushitsu no Sekuhara Majin

Although he had graduated from University, Yuuya was jobless; that's why he couldn't say no when his grandfather asked him to manage his old apartment. Once in the past, Yuuya had a crush with one of the renters, Shino, a gentle big-brother-like man who has excellent drawing skills. Unfortunately, that man now has turned into a sleazy adult with perverted attitude! Not only that, Shino kept pushing himself on Yuuya! Things get more complicated after it was revealed that Shino is actually the author that Yuuya has always admired?

(Source: Torico, edited)