Namida no Memory

Namida no Memory summary:

After a nice get-together party with guys from his university, Atsuhiro wasn’t expecting to wake up naked the very next morning with a used condom around him. To make matters worst, he couldn’t remember a damn thing! Armed with only the recollection of a naked, flat chested body, Atsuhiro is determined to get down to the bottom of this and enlisted the help of his good friend, Makoto.