The ALS in series is actually a terrible disease and pretty painful even if you just know a person that has it. The script and music in the series are very good and I rarely make reviews so I don't know what to type, but this was actually a drama that I would give nearly 10/10, because of all the feels and realistic acting and perfectly fitting music.

Shortly said the series is about a guy that has ALS and has to suffer with it. His family is not really supportive or close at start, but slowly everything starts to become more closer and warmer though the ALS gets worse. I don't want to spoil much, but that's pretty much how it gets going.
(Boku no Ita Jikan honestly feels like something you could relate with, even though you have nothing actually relatable)