Meishyoku no Reiki:Formations

Formations
Before each battle it is possible to select a formation, that your forces will use during all three stages. Common formation (通常陣形) is not always the best choice, but it is available by default. To use other formations, leader of squad must know at least one skill from skills 15-24. There are seven total formations and it can make a great difference when you use them right. Skill 27 (敵陣偵察) allows you to see the formation that enemy has chosen (only if enemy squad does not have the same skill), so it is good to have one unit with such skill in your squad.

通常陣形 (common formation)
Simple formation that is available by default. Weak against most other formations.

密集陣形 (dense formation)
Good formation for defense, unit 4 is untouchable until someone else is killed or enemy has shooting skills.

Table of compliance
Bold shows combinations that provide substancial bonuses agains enemies.