Konosuba: God's Blessing on This Wonderful World!, Vol. 21 (manga)

Megumin’s adorable little sister, Komekko, has arrived in Axel! Her fellow Crimson Magic Clan members Funifura and Dodonko are along for the ride as well, and before they know it, they wind up right in front of Kazuma’s party. Komekko attempts to explain her situation, telling the group that her house...blew up? Sounds like more trouble’s in store for Kazuma...