xー's manga / #Smut(2)

I liked the art!! but one thing that im curious abt is why the mc immune? plot is interesting thats why i thought there were more chapters, but then its the end.. i still wanna know why the mc is immune tho, im expecting him to have his mother scientist and she sacrificed her son to be the experiment thingy some sht. But i like it so far, i just hope there's another side story ° ͜ʖ ͡ -