According to Amazon Japan, a two-volume OVA series "ToHeart 2
Dungeon Travelers" was announced. The first and the second volume will be released on February 22nd and March 21st 2012, respectively.
ToHeart2 Dungeon Travelers Game official website
"ToHeart 2 Dungeon Travelers" is an RPG game on PlayStaion Portable released in 2011.
Source: Amazon Japan
To Heart 2: Dungeon Travelers