Magatsu Mandala is named after the sub-area of Magatsu Inaba in Persona 4. As a skill, it was first used as one of Tohru Adachi's awakening moves in Persona 4 Arena Ultimax. Adachi can use it to give himself a buff that makes Magatsu-Izanagi inflict different status ailments with his C and D button Persona moves. The DLC for Persona 5 added Magatsu-Izanagi as a Persona with a skill of the same name. The Persona 5 skill takes inspiration from the Persona 4 Arena Ultimax skill and also inflicts status ailments.
Adachi is a playable character added from Persona 4 Arena Ultimax. He retains Magatsu Mandala from his original skill kit. It no longer makes Magatsu-Izanagi inflict status ailments, but can still be used to launch opponents into the air.
Trivia
When Joker uses Magatsu Mandala in Persona 5, he has two possible voiced lines that are based on two of Adachi's battle lines in Persona 4 Arena Ultimax.