Maybe I should shift my focus away from more old-school notions of otaku-dom to more modern concepts like this one.
MY DAD'S THE QUEEN OF ALL VTUBERS?! (Oyaji ga Bishojo ni Nanetta Hanashi?!), by Wataru Akashingo. First published in 2019 and first published in North America in 2020.
PLOT:
Of all the VTubers out there, none of them are more popular than Kisuke Yae. To an ordinary teen boy like Takashi, she's a dream come true. That dream is shattered when he learns that the person behid Yae is his own father. He's quite happy in his new job, but he doesn't want his wife to learn the truth. That's probably for the best considering that she also is a secret VTuber who is struggling to find an audience. Can Takashi juggle both of his parents' secret lives without the other finding out? And can he avoid falling into the VTuber lifestyle himself?