For the specific "WEBRip" release you mentioned, subtitle files (.srt) are often hosted on community databases. Note that these are unofficial and may vary in translation quality: Film Review: My Broken Mariko (2022) by Yuki Tanada - IMDb
Available for purchase or rent in certain territories. Community & External Subtitle Files subtitle My.Broken.Mariko.2022.JAPANESE.WEBRip....
To ensure high-quality and accurately timed subtitles, it is best to use official streaming services: For the specific "WEBRip" release you mentioned, subtitle
You can also find it on Rakuten Viki, which often features fan-contributed community subtitles. which often features fan-contributed community subtitles.