Apparently it's a spinoff of Brothers Conflict, a novel for female audience that was made into an anime last year.
"Please tell me what kind of career do you like. I'll be what you (older sister) like the most!"
"Of course, pro gamer!"
*Image of Umehara with JFGC's memes*
Note that this's the first time in a long while for an unofficial manga that Umehara isn't turn into a girl....