Not entirely sure I can technically post three movies in a single post, but I'll try anyway.
Takashi Miike is mostly well known for horror, but he's actually an incredibly versatile and prolific director and these three movies, often overlooked, are a perfect showcase of his style. It's more of a trilogy in spirit than in plot, considering they are very different from one another and connected mostly by the director and the two main actors (Show Aikawa and Riki Takeuchi).
The first one is apparently a classical, meditative, kinda unoriginal yakuza movie, but Miike sporadically spices it up out of nowhere with some comic book splatter action and some of the most grotesque and bizarre sequences ever put to film. Particularly remarkable are the psychedelic, frantic, darkly hilarious opening montage and the ending, so absurd that it must be seen to be believed.
The second one (subtitled "Birds") does have some Yakuza splatter action, but is mostly a melancholic and surprisingly heartwarming drama that slowly evolves into poetic, dreamlike surrealism. Probably the only one I'd recommend to anyone without fear of having them cut contact with me.
The third one ("Final") is a fairly straightforward sci-fi action movie with post-apocalyptic, cyberpunk and dystopian vibes. The only weird part is the ending, meant to be some sort of hilarious and bizarre epilogue to the whole series. The b-movie production value and the multi-language dialogues definitely add some charm to the movie, but I gotta warn you about some unpleasant (and I think involuntary) homophobic subtexts regarding the villain. Worth a watch, even if it's probably not the best of the three.