Happy Storm is a fanon move for Ryōki in Senran Kagura Series. It is an advanced version of Happy Rain and a Ultimate Ninja Art.
Ryōki just throw a certain distance away her shield, with the plate away from her and to slightly angled to the ground. It moves in circle around her while firing rains of missiles, and is grabbed back by Ryōki.
She finally jump into the air, the shield directed to the ground, and fire the last missile, which finish the storm. She finally just fall graciously fall back on the ground.