The Saint's Magic Power is Omnipotent manga volume 1 features story by Yuka Tachibana and art by Fujiazuki.

Living the workaholic life in her mid-20s, Sei never expected she’d be summoned to another world, let alone obtain the power of a living Saint. And she especially didn’t expect to be totally ignored by the locals! While the kingdom desperately needs a hero, it turns out Sei was just the backup option. Left alone, she explores her newfound powers at the royal Research Institute, unraveling the mysteries of magic potions. As she helps the sick and the dying, her talents reveal themselves. Might Sei be the Saint this world needs after all?

The Saint's Magic Power is Omnipotent manga volume 2 features story by Yuka Tachibana and art by Fujiazuki.

Sei was summoned to a world in desperate need of a hero: a Holy Saint who could purify all evil. Unfortunately, she didn’t quite make the grade as a Saint, but her talent for making potions has saved a lot of lives, not least of all that of a dashing, handsome knight-captain. Much to Sei’s surprise, the supposedly frigid Winter Knight proves quite warm, and now the two have suddenly found themselves out on a date! With skills like hers, it won’t be long before she’s exploring all kinds of new magical frontiers.

The Saint's Magic Power is Omnipotent manga volume 3 features story by Yuka Tachibana and art by Fujiazuki.

The land of Salutania needed a savior, but Sei didn’t get chosen for the job. Stranded in an unfamiliar world, she wound up finding all kinds of ways to keep busy: potion-making, enchanting, and accidentally romancing a handsome knight! Deep down, though, Sei always knew she had the power of a Saint. When she reveals that power by regenerating a wounded man’s missing arm, will her peaceful days be over for good?

The Saint's Magic Power is Omnipotent manga volume 4 features story by Yuka Tachibana and art by Fujiazuki.

Sei thought she was summoned to another world completely by accident—a bystander, a leftover, and most certainly not the Holy Saint of legends. After a short struggle, she’d finally found a happy place for herself as a potionmaker and enchanter. But thanks to her literally miraculous powers, no one can deny that Sei really is the mystical savior the world’s been waiting for.

Now there’s a whole new struggle, first to hone her powers underneath the boyishly handsome Grand Magus Drewes, and then to navigate the political consequences of her saintly power. What will become of the lovestruck prince who foolishly backed Sei’s rival Aira, or the poor girl herself, after failing to live up to everyone’s expectations?