I think it’s a ware mark. The calligraphy used can make the kanji neigh illegible even for native Japanese readers.

Hey! You get away from my food, my friend, my two emergency foods, and my son! In that order!

I’ve been watching Kaname Naito on youtube, and he has some videos talking about pronoun choice, including touching very briefly on women using boku.

I’m only a Japanese learner myself, and this is a video by a guy, so… take with a couple grains of salt, I guess?