If the picture means nothing to you, then count yourself lucky. Since the release of the animated movie, 鬼滅の刃 (Kimetsu-no-Yaiba) aka Demon Slayer, at the end of October I've heard the names Tanjiro, Nezuko, Zenitsu, Inosuke, Tomioka and Sabito (pictured) multiple times a day, from our very youngest students all the way through to Junior High School! Sometimes it seems to be the only thing they are talking about, and when they are not talking about Kimetsu, they are drawing the characters on the whiteboard, in the corner of their worksheets or, as in this case, on a scrap of paper.
Having no desire to sit through a screening of the movie, I have no idea what it's all about but it ceratinly seems to have struck a chord children of all age groups, and unlike the Frozen boom of a few years ago, it's equally popular with both boys and girls.