Rank Up Defence

Unit will class change by your tap and defeat an enemy!
You can use special ability when unit ranked higher!

It will be a victory if it bears to the time limit.
By accumulating a gauge, the class change of the ally units can be carried out temporarily.
If a gauge is stored more, a new swordsman unit can be added.
Furthermore, if a gauge is stored to the maximum, it will be ranked higher and a new class will be released.
A maximum of 15 levels can strengthen.

The time limit can be chosen 1 to 15 minutes.
It can play to kill time.