In the Shikigami no Shiro series, Bombs are one of the three attack methods the player can perform, as well as the strongest attack of each character. Everyone has their own unique bomb attack exclusive to each character, though very few characters in the series actually share the same (or have a simliar) bomb attack.
At the beginning of the game, or after using a continue, the player is given a stash of three bombs. Every time the player is hit by an enemy or an enemy projectile, or once a specific score is reached, the player's bomb supply increases by one, up to a maximum of five.
Bombs are often used for three purposes- To deal great damage to one or several enemies, to remove every bullet on the screen fired by enemies, and render the player invincible during the bomb's duration. The only downside to using bombs is that enemies will not release coins.