Hentai-sama wa Senpai-sama!

That flirtatious manner... Those sweet nothings... She's had enough of playing around with men who are more concerned with themselves than a potential partner! But if she's going to have something sweet, she might as well get her fill...!! Eri Hosokawa, a thirtyish office worker in Tokyo, is beautiful and popular with men, but terminally unlucky in finding a lasting love. Nagata, a senior colleague, is reliable and well-liked around the office, but he's the same sort of no-good, full-of-himself perpetual bachelor she swore she wouldn't fall for... and yet, when she sees Nagata lamenting his lack of prospects, even she can't help but feel bad for him. But how did she end up staying at his apartment?! (Source: MangaPlaza)