It will be directed by Masashi Ishihama (PERSONA5 The Animation).
Series composition (script writing) will be handled by Takao Yoshioka (Your Lie in April). Prepare for the feels.
More details: https://twitter.com/RanobeSugoi/status/1306243258796789762?s=20
Masaru Yokoyama, by the way, COMPOSED THE FRUITS BASKET 1ST SEASON AND 2ND SEASON OST.

As I did say, WE'RE FUCKED.
Haruko Iizuka btw worked with not only the mentioned anime, but also with gorgeous anime like Children of the Whales and the new Black Butler anime. Her profile can be found here:

https://twitter.com/hal_i_00 
Lastly, it is not yet revealed in the leaks whether Horimiya (2021) will be a single cour or two cour anime, but expect further announcements on that soon.
New announcements from Natalie: https://twitter.com/comic_natalie/status/1306608944278691840?s=20
Natalie's article includes the messages of congratulations and assurances from Uchiyama, Tomatsu, HERO-sensei and Hagiwara-sensei that they will do their best to deliver a quality anime and roles for fans, as well as thank you's for everyone's support. These were in the leaks.
Also on 21 September, 21:00 JP time on ABEMA TV, a program entitled "Horimiya Super Slightly Carbonated Abema Special" will have information on the anime, with Haraichi's Yuuki Iwai as the MC, and Uchiyama and Tomatsu as guests. The PV for Horimiya will also be released.
This account will be doing a live translation of the commentary there if I manage to watch them airing (apparently this will be either livestreamed on Youtube or Bilibili) so please stay tuned!!!
Also the Twitter account and websites for Horimiya is now officially OPEN https://twitter.com/horimiya_anime/status/1306608856408240131?s=20
Also, Hagiwara-sensei has actually made a GIF commemoration for the Horimiya anime! This is also his own official confirmation for the whole thing as well. https://twitter.com/D_hagi/status/1306609333065580547?s=20
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