Lord Monarch -Shin Gaia Oukokuki-

You are prince Alfred, the son of the great king of Monarch. Since you have been a rather fresh and lazy boy, the king decides to strengthen you by sending you to battle. You are now sixteen, and you must prove you are worthy of being the prince of Monarch!

This is a strategy war game. You command an army and can perform various actions, such as sending troops, fortifying your position, allying with another ruler, etc. There are time limits to your strategic operations during which you'll have to defeat the enemy.

[From psxdatacenter]