@Khri_na He must go on a legendary quest to retrieve batteries for his Sexcalibur, so that he may embarrass both himself and everyone reading this manga further.
That or it has infinite charge because BS Isekai plot.
“Of course you haven’t heard of it. Only 1 in 10,000 people have it.”
Pretty sure he’d know bout it when almost 13,000 people in Japan alone would supposedly have it.
Of course, rom-com MCs are dumb, so maybe it all makes sense.