Honestly, I wrote my own translation of the main text at first, but then I tried chucking it into DeepL and the prose was way better (only made some tiny modifications)

近年きんねん、「 LGBTQ 」という言葉ことばを見聞みききする機会きかいが増ふえてきました。
でも、「 LGBTQ 」の人ひとを身近みぢかに感かんじている方かたは、
どのくらいおられるでしようか？
もし、「会あったことがない」「身近みぢかにはいない」としても、
あなたの周まわりに「 LGBTQ」の方かたがいないのではなく、
様々さまざまな思おもいや事情じじょうを抱かかえて、
誰だれにも伝つたえていないだけかもしれません。
この機会きかいに、性せいの多様性たようせいについて考かんがえてみましよう。(京都きょうと市し)

In recent years, the term “LGBTQ” has become increasingly common. But how many of you are familiar with LGBTQ people? Even if you have never met someone or don’t know anyone who is LGBTQ, it may not mean that there are no LGBTQ people around you, but rather that they have various feelings and circumstances that they have not shared with anyone. Let’s take this opportunity to think about sexual and gender^[1] diversity. (City of Kyoto)

The bit on the side which is sort of the attention grabber/call-to-action (translation again courtesy of DeepL):

あなたの身近みぢかな人ひとの中なかにも、
誰だれにも相談そうだんできず、
一人ひとりで悩なやんだり、
周囲しゅういの言動げんどうに傷きず付ついたり
している人ひとがいるかもしれません。

There may be people close to you who are suffering alone, unable to talk to anyone about their problems, or are hurt by the words and actions of those around them.

One last cute detail that I almost missed because I thought it was boilerplate:

本ほんポスターに掲載けいさいのイラストは、
京都きょうと精華せいか大学だいがくマンガ学部がくぶの学生がくせいに作成さくせいいただいたものです。

The illustrations in this poster were created by students of the Manga Department^[2] of Kyoto Seika University.

All in all, I think it’s a lovely little poster! I’ve been feeling pretty doomer these last few days so it was good to see a little ray of light and also get my mind off of things by making the Japanese part of my brain chooch

edit: fixed typos (thanks Erika3sis!)