Dahlia in Bloom: Crafting a Fresh Start With Magical Tools Volume 7 by Hisaya Amagishi

The late autumn air is frigid, and it is the time for Dahlia to restart the development of a certain heating device from her previous world. However, the tool has a high price: it takes prisoners and is unwilling to listen to reason. Dahlia drags some very important guildmembers and merchants into her new invention, and the whole Kingdom of Ordine eats it up. Will Volf and the Rossetti Trading Company be able to resist the temptation the device creates to stay awhile and imbibe? Or will they surrender themselves and let it sap their energy and willpower? With new employees, Dahlia continues to lead her company to greater heights!