EXS1～EthnologySister：Cultural functionalism

Auto-translated A boxer high school student meets a blonde nun on a southern island—she is his childhood sweetheart whom he hasn't seen for years, and she's changed greatly from his memories. The more joyful their reunion, the more secrets seem to hide behind it. Combat, mystery, supernatural, healing, deduction—the plot continuously twists and turns. What is the truth behind the raven-like woman who came to kill, and all the secrets of this island...?