A Certain Scientific Railgun S: All the Important Things I Learned in a Bathhouse

Honestly, this OVA is silly, relaxing, and full of laughs. It won’t move the main story, but seeing Mikoto and friends just being themselves is oddly heartwarming. A fun, guilty‑pleasure detour from the chaotic series <3

A 6 minute episode of fan service, this is an anime only and will not affect the storyline of ACSR. In Index timeline this is before Daihaseisai and in Railgun this is before the Level 6 shift attempt. It is a wholesome short episode about friendship and BUST UP😏

Pure of fan service lol, welp i can't complain because... MISAKA BEST GIRLLL

This OVA is pure fan service fluff, but honestly? It’s a great breather after the heavy Sisters Arc. Don’t expect any actual plot—the "Important Things" are just the girls hanging out in a bathhouse, Kuroko being a total creep, and Saten teasing everyone.

The season opens super chill with goofy bathhouse energy, chaotic friend banter, and classic comedy moments, but if you’ve watched this series before you can already feel the show quietly planting seeds for something way heavier down the line.

A simple cute episode that seems to be just a fun little side adventure. So short it's worth a watch for fun but don't expect anything with depth. A big fan service ending caps this mini episode off.