Fierce Fighting is the 7th chapter of Tsuyoshi Watanabe's Dragons Rioting.
Summary
Before Rintaro and Hatenko can start their fight, Rino intervenes and convinces Hatenko to leave. Then, setting her sights onto Rintaro, Rino declares her intent to remove the trouble-maker causing Ayaneto step forward and fight on Rintaro's behalf. Enduring a tough battle, Ayane is defeated by Rino and then taken to the infirmary by Hatenko with Rintaro following, where they learn from Hatenko about Rino's older sister and former Dragon, Ren.