I remember reading this series many years ago and thanks to the "challenge," I just quickly re-read the manga. This sad to end early story just consisted of a powerful Gang boss who got an operation to look like a teenage girl? I haven't seen many titles use this kind of setup, so it's very rare? It's good to see the MC isn't overly powerful in any way whatsoever. It's within the realistic aspects of being a human who learned combat skills. Pair this with his interactions of regular students and school life while fighting off gangsters. The long term potential was there since it achieved goodbalance all around, though this just another series that ended a bit too early.