In Over My Head With a 38-Year-Old

"If I went to Tokyo, maybe I could get a boyfriend!! Maybe I could fall in love!!"

Or so he had always dreamed. But when college student Shota finally makes his first visit to Tokyo's gay district, Ni-chome, he strikes out big time. While despairing that he's just not cut out for dating, Shota comes across a foul-mouthed but kind donut shop owner and the delicious donuts he makes, which both help him start to get back in high spirits. However, when Shota accidentally catches sight of a new, more R-rated side of the donut shop owner... What will happen to this airheaded college student, and his dreams of true love, at the hands of this "adult" donut shop owner?!

(Source: MangaPlaza)

Note: Includes one extra chapter.