Onegai! Renhou

Yuta Nagamine adores his classmate Kitakaru Kyoko, but he's to shy to covey his feelings to her. Because of that he's being tagged as stalker.

One day mahjong's fairy "Rinba" appears with a magical sphere where "mahjong dragon" who can can accept any wish is sealed. Yuta jumps at the occasion and decides to challenge five familiar girls in undressing mahjong game.

[From vndbreview]