Mega Miracle Force

Idea Factory's 25th anniversary mobile game featuring characters from over 70 titles, including games by Compile Heart, developed by Zoo Corporation and Axel Corporation.
The game uses a 5 vs 5 strategy battle system on a 7 by 5 grid.

It is set in the Hyperdimension Neptunia world and some characters from different games can be fused together to create "Mega Miracle Characters".
An example used in the promotion for the game is Hirotune, a fusion between Spectral Force’s Hiro and the Neptunia series’ Neptune, shown at the end of the second trailer.