Jahy is the second-in-command of the Dark Realm until a magical girl appears and shatters a giant mana crystal, destroying the Dark Realm and causing Jahy to lose almost all of her magical powers, leaving her in a small form. Determined to find the shattered parts of the crystal so she can regain her power and restore the Dark Realm, Jahy is forced to live in a run-down apartment while using her remaining magic to temporarily regain her adult form and work part-time at an craft pub...