Alicia-san no Diet Quest

Use Slime as an exercise ball! A treasure chest as a stair-stepper! Low-calorie herbs as snacks! Powerful weapons, phenomenal magic, and fierce monsters! The beautiful priestess Alicia will try anything and everything in her struggle to lose weight! Cuz before she can defeat the Demon King, she's gotta defeat this accursed blubber!

(Source: Kodansha USA)