※２０１７年４月１５日ＧＡノベルさん２巻発売します！ 皆さんのおかげです！
ごく普通の社畜ＯＬ、相沢梓は働きすぎが原因で過労死した。
そのため、１７歳の容姿を持つ不老不死の魔女として、高原の一軒家でスローライフを送ることにした。
主な収入源は近くに生息するスライムを倒して魔法石を手に入れること。これをふもとの村のギルドで売っていた。ほかにも、薬草の知識を使って薬を作ってあげたりして、「高原の魔女」として感謝され、敬意を集めて生きていた。

だが、３００年もスライムを倒す生活を続けてきた結果、経験値が蓄積しすぎて、知らないうちにレベル９９の世界最強の魔女となっていたことが発覚。

レベル９９の魔女は今日も村のみんなのため、世の中のために、弟子のドラゴン少女とともにほどほどに働きます。

Aizawa Azusa, a very ordinary office lady, died due to overwork.

For that reason, she decided to live a leisurely life in an isolated home near a plateau as an immortal witch with the appearance of a 17 year old.

Her main source of income is defeating slimes and acquiring their magic stones. She sells these stones at the guild of the village near the base of the mountain. Besides that, she also makes medicine from her knowledge of medicinal herbs. She came to be known as "The Witch of the Plateau" (高原の魔女) for the honor and gratitude she has been given for her efforts.

However, as a result of continuing life defeating slimes for 300 years, she accumulated too much experience and before she knew it, it came to light she was the world's strongest witch at Level 99.

A story about a Level 99 witch working together with her dragon girl disciple for the sake of everyone in the village, and for the world.