The Brilliant Healer's New Life in the Shadows: Volume 3

With everything at the Royal Institute of Healing settled, Zenos, Lily and Carmilla return to their routine at the clinic in the ruined city. As Zenos reminisces about his mentor and his past, the three demi-human leaders announce the slums’ first-ever night festival to foster camaraderie and provide people with much-needed entertainment. Of course, the three of them being who they are, the festival also ends up turning into a “friendly” competition for Zenos’s heart. In a shocking turn of events, the peaceful festival is very nearly ruined by the sudden appearance of a certain underground faction of the slums...

[From J-Novel Club]