Story
Azusa Aizawa, a very ordinary office worker, died of exhaustion due to overwork,
and was reincarnated into another world as Azusa, an immortal witch.

Regretting her previous life, she begins to live a leisurely slow life in the remote highlands.

She earns small change by killing slimes, makes potions like a witch, and takes care of the village at the foot of the mountain.

The rest of the time, she does nothing in particular. As she continued to live like this, she came to be fondly known as the 'Witch of the Highlands'――.

But 300 years later.

With the experience points she gained from killing slimes, before she realized it, she was level 99 = Azusa had become the strongest person in the world.

Word spread, and not only adventurers with confidence in their skills, but also a dragon girl who challenged her to a duel, and even a mysterious monster girl who called Azusa her mother all began to show up uninvited――!?