One girl paused her suicide because she got to meet the only thing, the only person in the world that she treasures than her own life
In that girl twisted mental illness, her most happiest wish, happier than releasing herself from the insufferable world, is to die with that one girl she treasure the most
The other girl still kept the shared memory book with that girl clean after 13 years of separation, and said her most alive moment was when she got to draw with that girl in middle school
If this is nothing gay to you, I suggest you drop this already, and go to, idk, gay corn maybe :v
You know friendship between women also exist. I know it's a concept that a lot of people tend to forget, women include but it really exist.
Saying that the happiest time of your life was when you shared with someone of the same gender or keeping something that reminds you of that time you share with that person is enough to make you gay... So we can consider that everyone is gay ! Even you most homophobic persons you know are gay.
And of course you would want to spend some times with that person when you are at the lowest times in your life and you even atemp to kill yourself.
For now, in the first chapter, we don't know if they are gay. No one confess to the other, no one show that they had some hidden feelings for the other, they can be straight, bi, pan or ace we don't know. Narratively speaking we don't know. You are interpreting their actions.
For now, the story is more center about depression, loneliness than sexuality.
And having the GL tag doesn't automatically defined the characters as gay. So wait and see.