I'll Never Set Foot in That House Again! Volume 5

Eight months after using her [Seed Creation] Skill to reverse the Martec Republic’s mana drought, it’s time for a special occasion: Chelsea’s fifteenth birthday! Experiencing her birthday with others for the first time, Chelsea’s huge coming-of-age celebration also marks a turning point in her life—being officially recognized as an adult in Chronowize. And as luck would have it, she receives an important request the very next day: visiting the Holy Country of Celesark as the foreign observer for the trial to choose their next Grand Saintess! Chelsea heads north to the Holy Country with her maids and Micah, for tea parties and adventure!

[From J-Novel Club]