Things get lively in the seventh volume of Yusuke Shiba’s manga adaptation of I’ve Been Killing Slimes for 300 Years and Maxed Out My Level, as Azusa and family visit a festival. They also continue helping out Kuku with her musical career.
This volume contains chapters thirty-six through to forty.

Front cover of the seventh volume of the manga adaptation of I’ve Been Killing Slimes for 300 Years and Maxed Out My Level, featuring Azusa and Pecora
Party at the rock fest! Will the new Kuku be a hit after tweaking her music a bit…?! Meanwhile, sparks fly when Halkara meets a serious business rival… And what’s this about a fighting contest in Flatorte’s hometown?
Much of this volume is focused on Kuku, and her attempts to reinvent herself as a musician. This all made it into the anime, but the manga offers up something that was somewhat glossed over: the demon festival.
Much like the light novel, we actually get to see Azusa and company exploring the festival, and finding some rather interesting sights. As well as some familiar faces.
Before the festival itself, though, we have effectively an entire arc for Kuku – with the festival itself being the climax for her. Even when Kuku’s arc comes to an end, there’s still plenty more to enjoy – Pecora and Beelzebub have quite the surprise in store to bring the whole festival to a close.
Besides the festival, we get chapters that focus on Flatorte and Laika’s hometowns. Fun stuff from both, with the characters getting competitive. Particularly Laika.
Another fun volume of the I’ve Been Killing Slimes for 300 Years and Maxed Out My Level manga, and it features something that didn’t make it into the anime. A lot to love here.