Wall

''The Wall protects your school and your school defense troops. Upgrade it to increase defense device capacity and school defense.''

The Wall is a major structure in the school system, and always needs to be upgraded to the same level as the Teaching Building before that building can be upgraded further. Its level determines how many bombs an attacker needs when attacking your school.

For the wall you need to choose a captain. This girl (Enabler) ''will defend your school. Only the captain can be captured.'' By default, the captain is Saki.

Upgrading the Wall has the incremental cost (i.e. cost to reach the level from the previous) and gives the increase in Power, Bomb Capacity, School Defense listed in the table below.