Kurumi takes out her cannon Kaboom-chan and then fires at her enemies as she lies on top of it, pelting her enemies with a barrage of cannonballs. She does this until the final shot is made, sending the enemies flying as she jumps off of the cannon.
- The attack's name is a reference to Hanabi's catchphrase "Kaboom!".
- The attack shows similarities to Ryōki's attack HAPPY RAIN.
- Both users attack with a barrage of bullets/cannonballs and the final blow causes enemies to be sent flying.
- The attack also shows similarities to Kurumi Whomping.
- Both attacks finish with a final blow.
- The attack was first shown in Episode ???.
- This is Kurumi's favorite attack.