Beneath Tokyo lies the enigmatic Underground, a realm teeming with Elemental Users endowed with mastery over elements like Fire, Water, and Lightning. Follow the tale of Rumina Asagi and his pal Ginnosuke Isuzu, regular high school newcomers in Tokyo, as they encounter Gravity User Chelsea Rorec and Life's Miko Ruri Sarasa, propelling them into a whirlwind of extraordinary escapades.