Greetings hackfans! Vita 3.15 VHBL news!
For those of you on firmware 3.15 looking to get in on a little homebrew action for your Vita, Wololo.net has just released the name of the game to download from dev @173210. It is called MyStylist, and sorry kiddos it is only available in the Japanese PSN Store. Another bummer is that the game is NOT compatible with the VitaTV (yes, a PSP game that doesn’t work on the VitaTV) so VitaTV owners get the shaft again.
Keep in mind that VHBL isn’t an eCFW, rather a homebrew enabler, which lets you run emulators and other fun PSP homebrew stuff. This will NOT allow you to run ISO/CSO files, but if you are already on 3.15 why not enjoy some of the awesome PSP homebrew and emulators out there. 
The VHBL files will be released at Wololo.net after the game is pulled from the JP PSN store. Happy Vita homebrewing!
Questions/Comments? Stalk me on Twitter @heleius
Source: http://wololo.net/2014/05/23/ps-vita-the-new-exploited-game-to-run-vhbl-on-firmware-3-15-is/