I'm pretty sure this is what Tim Rogers from Action Button Reviews has. His masterpiece Boku no Natsuyasumi review goes into a lot of detail about it. The end of part 5 had me literally sobbing in my chair for the first time in perhaps 20-some-odd years, followed immediately by a very confused laughing at a surprise hbomberguy appearance. I'd highly recommend watching it - it's quite the long form journey.