Rashōmon tiger (MHA x Bungo stray dogs x male reader)

Y/n Akutagawa the younger brother of Ryūnosuke Akutagawa are both in the port Mafia. One day they're both sent on a mission to deal with some possible traders but during that fiasco the hero showed up putting both Y/n and Ryūnosuke in a tight situation so when Ryūnosuke saw his chance to get away he used abandoning his brother without hesitation and after a short battle with the heroes Y/n was captured. When Y/n woke up he saw some weird type of creature in front of him introducing himself as the principle of UA