Slime Taikou to Botsuraku Reijou no Angai Shiawase na Konyaku  

A Surprisingly Happy Engagement for the Slime Duke and the Fallen Noble Lady, スライム大公と没落令嬢のあんがい幸せな婚約

Lady Francette experiences a sudden loss of wealth and status after her sister's engagement with the crown prince is called off. Left with nothing but her name and determination, she moves to the slums and starts selling homemade pastries to make ends meet. While there, she meets Wibble, a talking slime who introduces her to Gabriel, the slime duke himself. To her surprise, Gabriel asks for her hand in marriage, which she accepts. Francette must adapt to life in Triste and its eccentric inhabitants. What was initially a marriage of convenience gradually becomes something more meaningful over time. Of course, expect plenty of slime along the way!

Slime Taikou to Botsuraku Reijou no Angai Shiawase na Konyaku has been published digitally in English as A Surprisingly Happy Engagement for the Slime Duke and the Fallen Noble Lady by J-Novel Club under the J-Novel Heart imprint since May 29, 2024.