Don't Cry, Girl

Thanks to her parents' incompetence, Taeko is sent to live with an acquaintance of her father. But when she rings the bell of her new home, she's greeted at the door by her new roommate, a completely and utterly shameless nudist named Masuda. Why exactly is he presenting himself in the buff to an innocent high-school girl...? Of course, their shocking first meeting sends Taeko's 17-year-strong values tumbling to the ground! "Is he for real?!" "Am I going nuts?!" It's too late for tears, so Don't Cry, Girl - a hilarious teen comedy ♪!

Source: Jmanga

It also includes a second story called 3322. (Unscanlated)

Nominated for the 4th Manga Taisho in 2011.