As much as I'd like to see what chapter 20 is going to be like, the numbering for this is all over the place between pixiv, the author's Twitter, and Gangan Online.
WHY??? WHY WILL IT MAKE ME CRY??? DON'T JUST SAY SOMETHING LIKE THAT. I NEED TO KNOW WHETHER IT WILL BE A SAD CRY OR HAPPY CRY. WHYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY?????????????????????????
@pants ah, so the brother conspires with truck-kun to isekai the Kumada into a fantasy Amazonian harem where he picks up purple fever, scrambling his brains.