How To Watch Strange: Junji Ito's Tales for Sleepless Nights
First, a reminder that this subreddit does not support or endorse piracy. Please do not post or comment links to piracy websites or unauthorized downloads of the episodes.
Links to fan-sub groups or subtitle files are allowed. At the time of writing, however, no fan group appears to be translating this series.
Option 1: Wait for the international release
The series has been announced for international distribution on HBO Max later this year:
https://www.instagram.com/p/DaW8WygkyMx/
Option 2: Watch through a legitimate Japanese streaming service
The series is available on legitimate Japanese streaming platforms such as Lemino, TVer, and U-NEXT. These services are intended for viewers in Japan and are geo-restricted, so you must either be physically located in Japan or use a VPN with a Japanese server.
Episode 1 on TVer:
https://tver.jp/episodes/epkios357o
I was able to watch the first episode successfully using VPN Gate's free public VPN service provided by the University of Tsukuba:
https://www.vpngate.net/en/howto_softether.aspx
If English subtitles become available from a fan-sub group in the future, you will need to find your own lawful method of obtaining a copy of the video in accordance with the laws of your country. Discussion of downloading methods is outside the scope of this subreddit. You can then use a media player such as VLC to load the subtitle file and synchronize it with the video.