Maybe the first "Yuri" manga magazine

On July 16th, a new manga magazine will be released:

Comic Yurihime

It will be published by Ichijinsha , the publisher of Comic Zero Sum, and will come out in January, April, July and October.
On the top of the website is the announcement "No boys * Declaration of girl's love restored!!"

In fact, I have never heard the words "girl's love" in my life as a native Japanese otaku.
There is yuri or lesbian manga as a subgenre in the genre of erotic manga aimed at male adults. Shoujo manga magazines often contain manga that deal with the tight friendship between girls and we sometimes feel a slight taste of lesbian in them.
In my opinion, Yurihime aims for the girls who love the latter magazines. I prefer yaoi to yuri, and I'm of two minds whether to try out it or not...

Postscript
Thanks to the kind comment, I found there was a yuri manga magazine "Yuri Shimai" until last year. This means one publisher's junk is another publisher's treasure.

New magazines published in May or later

* New manga magazines published in May *

Asuka plus macbeth
Pub date: May 2
Publisher: Kadokawa Shoten in associate with Animate, franchised shop for manga & anime stuff

Owarai Channel
Gag manga magazine.
Pub date: May 9
Publisher: Akita Shoten

Jun Ai
Lady's comic magazine scheduled to be published every other month
Pub date: May 11
Publisher: Sun Shuppan

Golf Athlete Comic
Scheduled to be published every other month
Pub date: May 17
Publisher: Shonen Gahou Sha

Shonen Sirius
Monthly fantasy manga magazine aimed for boys
Pub date: May 26
Publisher: Kodansha

Moyori
Information magazine that also contains manga.
Pub date: May 30
Publisher: Fox Shuppan

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* New manga magazines scheduled to be published in June or later *


Chu Girl
Monthly manga magazine for girls
Pub date: Not available
Publisher: Kodansha

New magazines published in April or later

* New manga magazines published in April *

大阪芸術大学大学漫画
(Osaka Geijutsu Daigaku Daigaku Manga)
Pub date: April 4
Publisher: Koike Shoin
This is rather an information magazine than a manga magazine created by Osaka University of Arts from which many artists, for example Anno Hideaki, graduated.
The first issue re-contains Takahashi Rumiko's debut mangａ　ｔｈａｔ　ｗａｓ　ｏｒｉｇｉｎａｌｌｙ　ｐｕｂｌｉｓｈｅｄ　ｉｎ　Ｗｅｅｋｌｙ　Ｓｈｏｎｅｎ　Ｓｕｎｄａｙ　ｍａｎｙ　ｙｅａｒｓ　ａｇｏ.
It will be issued quarterly.

Comic Magazine Lynx
Pub date: April 9
Publisher: Gentosha
Boy's love manga magazine scheduled to be published every other month.

BasiL
Pub date: April 15
Publisher: Bunendo
Boy's love manga magazine scheduled to be published quarterly.

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* New manga magazines scheduled to be published in May or later *

Asuka plus macbeth
Pub date: May 2
Publisher: Kadokawa Shoten in associate with Animate, franchised shop for manga & anime stuff

Shonen Sirius
Monthly fantasy manga magazine aimed for boys
Pub date: May 26
Publisher: Kodansha

Chu Girl
Monthly manga magazine for girls
Pub date: Not available
Publisher: Kodansha

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Followings are managa magazines for adults published by minor companies; they tend to contain one-shot stories that will not re-published in tankoubon.

Angel Share
Pub date: April 23
Publisher: Tsukasashobo

Flamingo R
Pub date: May 21
Publisher: Sanwa Shuppan

Platinum
Pub date: Not available
Publisher: Heiwa Shuppan