Inspired by @RandomUsagi, I have compiled sources relating to the films (articles, blu-ray, manga, subbers info etc.).
Official:
Official Film website: https://restart-movie.com/
Announcement article: https://www.crunchyroll.com/anime-news/2020/04/29/cocomis-boys-love-manga-restart-after-come-back-home-gets-live-action-film-this-fall
Announcement article #2: https://psycho-milk.com/2020/05/03/restart-after-come-back-home/
The film's gofund page (Fans had supported the film during the pandemic): https://motion-gallery.net/projects/restart-tadaimanoatode
Manga: Main Manga story & Manga Sequel
Behind the scenes/promotions:
Trailer (with Eng Subs) - https://www.youtube.com/watch?v=4qng-GxF9rE
Behind the scenes - https://www.youtube.com/watch?v=-PXj3HArRbU
Interviews:
Ryuusei and Furukawa-san answering what words left an impression by their seniors - https://www.youtube.com/watch?v=k7MUWJGttnA
The kiss scene discussion - https://www.youtube.com/watch?v=xAL4MgSyiSY
Movie collection Jp interview: https://www.youtube.com/watch?v=4t5u6QurLsY
Horipuro Square interview: https://www.youtube.com/watch?v=EPf_rH8hl1Q
Film info and subber's analysis:
Film Trivia (Character and setting analysis, including Film and Manga comparisons) - Contains Spoilers
Subber's notes (Meaning behind character interactions/dialogue and Japanese culture surrounding the film) - Minor Spoilers
https://ichihachiblog.tumblr.com/post/640375993775816704/restart-wa-tadaima-no-atode-subbers-notes
May add more updates ^_^
