What the heck is "make/do puni puni" (Puni puni-suru)? As far as I know, puni puni is an onomatopeic word for something that "jiggles" while pressed, which sounds... interesting at least.
Anyways, this is based on Strike Witches franchise (anime/manga/who knows what), so I guess the basic knowledge of them should be required.
I tried watching the anime once but it wasn't my cup of tea so I can't say much more.
I thought witch-touching games were no longer allowed in Japan... I suppose this must have slipped past the radar, because it has some silly mini-games for distraction. Then again, the touching is probably just some sort of mini-game, too.
I used to like games like these, but after a while, I found out that other games were much more fun. Only perverts play this.