Hmm, I would recommend starting with the earlier stuff but not completely chronologically. The demo tapes are good but it’s better to begin around the 5~7 Jikkenshitsu. I think that dai5 (第5実験室) is their best album ever but it leans harder to the experimental side so it might be best to start with their best album Good-Bye (グッド、バイ。) which is a really great introduction for beginners. That being said, if you wanna go knee-deep into that Misshitsu Kei weirdness then you can skip past the best and try this order → 第5実験室 (dai5 jikkenshitsu)–> 第6実験室 (dai6 jikkenshitsu) → 第7実験室 (dai7 jikkenshitsu). 5 is more like experimental with a stronger jazz-rock influence, dai6 strikes a balance, and I’d say dai7 is the definitive “Misshitsu Kei” sound (i.e heavy on the post-punk and new wave but still with a bit of jazz/experimental in it)
From those descriptions, you can choose your own adventure, really, you don’t have to prescribe to my order. Their newer sound has more of Shuuji’s new wave/electronic leanings but I really like it too. 10, ≠, and 14 really stand out to me. Also, you can’t go wrong with Bluefilm.
Their stuff’s on MH but if you need help, I can lend ya a hand. I also have their newest mini (Bluefilm revival) up on the “flipside” wink wink