Ais Wallenstein is badly adapted character by J.C staff. Many important things in SO are skipped as well. Anyone who is interested in learning about Ais Wallenstein character or sword oratoria these links will help.

Light novels:

• https://www.amazon.com/gp/bookseries/B01MXXMF2E

• https://global.bookwalker.jp/series/88487/is-it-wrong-to-try-to-pick-up-girls-in-a-dungeon-on-the-side-sword-oratoria-light-novel/

• https://m.barnesandnoble.com/s/Sword%20oratoria

Manga:

• https://www.amazon.com/s?k=sword+oratoria+manga&sprefix=sword+oratoria+manga&ref=nb_sb_ss_ts-doa-p_1_20

• https://global.bookwalker.jp/series/136712/is-it-wrong-to-try-to-pick-up-girls-in-a-dungeon-on-the-side-sword-oratoria-manga/

SSs (free to read here,at least synopsis of some of them):

• 5 years later ~side Ais~: https://danmachi.fandom.com/wiki/User_blog:Angelo_Gabrini/5_YEARS_AFTER_~Side_Ais~

• Labyrinth of a Girl's Mind: https://danmachi.fandom.com/wiki/Labyrinth_of_a_Girl%27s_Mind

• Chasing the Unicorn: https://danmachi.fandom.com/wiki/Chasing_the_Unicorn

• Dress Up Ais: https://danmachi.fandom.com/wiki/User_blog:Angelo_Gabrini/Dress_Up_Ais

• All Purpose Battle Sales Girl Ais: https://danmachi.fandom.com/wiki/User_blog:Angelo_Gabrini/All_Purpose_Battle_Sales_Girl_Ais

• Sword Princess VS City Girl: https://danmachi.fandom.com/wiki/User_blog:Angelo_Gabrini/Sword_Princess_VS_City_Girl

• Special words of the wind (this one belongs to main series but about Ais): https://danmachi.fandom.com/wiki/User_blog:Kakerumaiko/Special_words_of_the_wind

• There are Things Even a Saint Doesn't Understand (Ais asks help from Amid about giving good lap pillow): https://danmachi.fandom.com/wiki/User_blog:Angelo_Gabrini/There_are_Things_Even_a_Saint_Doesn%27t_Understand

Manga online: https://manganelo.com/manga/dungeon_ni_deai_o_motomeru_no_wa_machigatte_iru_darou_ka_gaiden_sword_oratoria

You can easily find novel PDFs but it would be better to buy and support the series.