Some game developers look at a touchscreen interface and see the potential for innovative new gameplay mechanics. Other game developers look at a touchscreen interface and see the potential for molesting underage anime girls.
'To Love-Ru' is a manga that has been running since 2006. Its popularity can no doubt be attributed to its alluring cast of pink-haired teenage anime girls who frequently appear in the nude. Two 'To Love-Ru' games have been released already, one on the DS and one on the PSP - and now a third 'To Love-Ru' title is set to be released on the Vita.
'To Love-Ru Darkness: Battle Ecstasy' is primarily an action game about defeating monsters in dungeons, but the developers have put strong emphasis on a minigame about fondling the game's heroines. In this minigame, appropriately named "Touch Trouble Time", the player must use the Vita's rear touchscreen to rub the girls from behind.
This is not the first time that a Japanese developer has released a game about rubbing the bodies of young girls; Doki Doki Majo Shinpan was a 3DS game about probing schoolgirls' bodies in search of a "Witch Mark" that identified them as witches. In that game, there was a clear reason for why the player was molesting underage girls, but as of this writing, the objective of Touch Trouble Time is unclear.
'To Love-Ru Darkness: Battle Ecstasy' is slated for a May 22nd release in Japan. Plans for an English release have not yet been announced.