Sekai wa Sonnani Warukunai

As his classmates go to mixers and enjoy their college-campus life, the closeted Sousuke spends his days wishing that he could find romance, too. Then, one day, seeking to meet people, he goes to a bath house he visits on occasion when who should he meet but the actor from an adult video he's "enjoyed" too many times to count!
(Source: Renta!)
Note: Contains the extra "Sonogo no Sekai mo Warukunai" (その後の世界も悪くない).