Manga with extremely jarring shifts

[Wake-the-winds]

List some manga with extremely jarring twists, genre changes, tone changes, sudden shark jumping, or some other sort of really strange and kind of out of left-field turn. Particularly WTF ones preferred. Good or bad series, good series becoming bad or bad series becoming good. You get the vibe. I want to read them. Thanks!

 

[Hornyturtle]

Tokyo esp changes mcs and eventually dives head first into full ecchi

 

[PantsMan]

Getenrou
Qualia the Purple
Golden Boy
Hoshi no Ponko to Toufuya Reiko
Narutaru
Good Night World
Hoozuki no Shima
Helck
Sengoku Youko
Wolfsmund
Fujimi Lovers
Otaku no Musume-san
Rojica to Rakkasei
Princess Candle

It's only half as fun if you already know a big twist/tone shift is coming up, so to keep you on your toes one of these listed series doesn't actually have one. They're all quite unique reads regardless, though.

 

[MawMaw]

@Wake-the-winds
YuYu Hakusho and JoJo for sure, I guess Kaiji too with its current arc lole.
Shokugeki no Soma have some infamous shift towards the last arc or something like that (I drop it ages ago and before reaching that point) and speaking of going downhill nosedive style:

Spoiler

Yakusoku no Neverland and Nanatsu no Taizai (and Magi too I guess)

try some of these:
Kokou no Hito
Ashita no Joe
Futari Monologue
Shed Ryugasaki-san
Centaur no Nayami
I Am A Hero
Kokuhaku
Alien 9
Demi-chan wa Kataritai
Yuzumori-san
and of course

Spoiler

Usagi Drop :^)

if you want to go wtf-ing from the start to finish you can check out Soil and Boku to Issho

 

[O-Takuni]

@Wake-the-winds Most of the stuff I would recommend was mentioned already, but I'd add Tsubasa and the king of tone shifts, Gintama.
Back to the Kaasan is a weird one.
Oh, you don't mind trash too, right?

 

[Baronoflight]

Futanari Elf

Gag penis manga turned into political-science fiction.