It’s a yaoi, so mc was tasked with the mission of collecting the cum of someone (lmao??) and the person had like rlly long white hair and was isolated or sum, his cum was used for like rituals iIrc. That’s all I remember lmao
if you're reading on mrm, there's a series and ships masterlist at the very bottom that shows you how many works are under a fandom or ship so that's probably a good place to start
This didn’t happened in the novel