Denkigai no Honya-san - Vol. 4 Ch. 21.1 - Extra

[MangaDex]

 

[daywithoutgames]

Hiotan = hi otaku + -tan . hi otaku means "not an otaku" , and -tan is a cute version of -san .

And Seaman is some crappy video game : https://en.wikipedia.org/wiki/Seaman_(video_game) .

 

[BilliusX]

Holy fuck Seaman. Fun reference.