Miss Kobayashi's Dragon Maid Volume 15

DRAGON BATTLE ROYALE! 

Tohru starts training with Elma to prepare for the Arena of Trials. But who will prevail when they find themselves up against three boss-tier opponents?! And what does Miss Kobayashi really think of Tohru’s desire to get stronger? Meanwhile, chaos ensues when Lucoa’s little sister unleashes her twisted love on Shouta-kun, and unknown depths of havoc are unlocked when Kanna learns about static electricity. It’s Volume 15 of this tale of humans and dragons learning to coexist! Series Overview: Miss Kobayashi is your average office worker who lives a boring life, alone in her small apartment--until she saves the life of a female dragon in distress. The dragon, named Tohru, has the ability to magically transform into an adorable human girl (albeit with horns and a long tail!), who will do anything to pay off her debt of gratitude, whether Miss Kobayashi likes it or not. With a very persistent and amorous dragon as a roommate, nothing comes easy, and Miss Kobayashi's normal life is about to go off the deep end!