I keep thinking abt 5u hc where kid!prince Go stumbled upon a holy priest/figure in his palace (yuu). He kept sneaking in there ever since, but then when Go came of age, he found out yuu actually a deity/magical entity kidnapped by Go's family due to his power to heal any kind of wound, even awakening the dead ones. He then went rampage, forcefully killing the current emperor. Idk where I'm going with this. I just love unhinged satoru who'd do things for yuu