It's a pass that lets you ride the train of a certain company unlimited all day. There's one that is available during school holidays for students (this one is for certain amount of consecutive days) and one for year round (while this one is for one). Hope this helps!
GENIUS.
OH I SEE THANK YOU VERY MUCH!!!
No problem. It's frustrating to see these little things referenced in manga (especially the ones about high school/slice of life) but not be explained to us foreigners.
I JUST DON'T GET IT....HMMMN HMMMN "IM GONNA BUY FREE PASS"...HMMN WHY YOU CALL IT FREE WHEN YOU'RE GONNA BUY IT? HAHAHAHAAH!!!!