It is in the style of Rurouni Kenshin's MANGA, not the film, not the cartoon, it is the original black-and-white MANGA.
No trigger words are specified, but the following cues will help:
monochrome, greyscale,
japanese_clothes,
retro_artstyle, 1990s_\(style\),
It is recommended to use 2D ckpt, e.g. Anything
weight about 0.9, and Hires Fix or i2i.
Also: I recommend the 4-part OVA anime Rurouni Kenshin: Trust & Betrayal to everyone.