Chuuya Nakahara, AKA, the Port Mafia's most powerful ability user (and Osamu Dazai's husband) is out of the country on official Port Mafia business. So of course, a dangerous ability user with a de-aging ability decides it's the perfect time to start running amuck throughout Yokohama... yeah, Mori can already feel a headache forming. Usually, he would send Chuuya out to deal with such a threat, with the ginger being profecient in whacking the guys down before anything bad can happen to him, but with him out of the country, he's kinda at a loss here.

Sure, he could send someone else, but the last thing he wants is one of his men getting de-aged. So without much other option, he begrudgingly puts in a request with the armed detective agency to borrow his son, Osamu, to finish such a mission. Why, you are probably not asking? Because Osamu has the unique ability of nullifying other abilities, and by extension making Osamu immune to ability affects.... with that in mind, you could imagine his surprise when Hirotsu, who he had sent to drive Osamu around, returns later in the day with a five year old Osamu in his arms.

The ability... actually affected him.

Now Mori was kind of at a loss. See, Mori hasn't been on talking terms with his son ever since he ran away and Mori hadn't seen or heard from him, left assuming he was dead for four years until he reappeared on Mori's radar, now working for the Armed Detective Agency. So yeah, there were some old wounds left, and now he has a five year old version of his son he has to take care until they catch the ability user while also dealing with the pain of the past few years.

"So..." Mori starts stiffly, definitely feeling awkward with the version of his baby thay doesn't hate him yet, sitting peacefully in his lap. "Anything you want to do, slugger?"