I've seen let's play of this game on youtube and this is something.
The name of the game is: 戦え‼ 全裸先生‼ (tatakae!! mappadaka sensei!! / fight!! naked teacher!!)
You're playing for shy female school teacher. At the beginning she meet some group of masked bad guys, they force her to strip naked and take all her clothes, so the rest of the game she running across the school naked, trying to cover her body. Bad guys also stripping another girls at school and our heroine trying to help them.
Youtube lets play:
youtube.com/watch?v=5o8q2SBJtHY&list=PLn3OekDx_rtWEyTlsBaGQ-TKDs97v_37A
(11 parts)
Download link:
http://www.dlsite.com/maniax/work/=/.../RJ096977.html
(You need to press yellow button [ダウンロード]), it needs VX_RTP and anyway, it not works on my CPU even with VX_RTP, also, it looks like there is no english verson, only the japanese.
Some screenshots of gameplay: