I've recently read this manga titled Smells Like Green Spirit and quickly became fond of it.
Can you suggest similar manga such as this.
A manga that portrays a realistic coming out of gay man and their struggles fitting in the society.
Thanks in advance.

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"The world is a dangerous place to live, not because of the people who are evil, but because of the people who don't do anything about it." <BR> - Albert Einstein

Maybe look in the tag Realistic Homosexual Relationship (sorry I can't make the link seem to work but you can find it in the tags). I only saw the anime, but I thought the coming out scene in Antique Bakery was good as well as Ono's troubles with society, but there were also of course unrealistic aspects.

have you try Koimonogatari ?

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Shimanami Tasogare, definitely.

Seconding Antique Bakery, and if you don't mind the characters a bit older, her What Did You Eat Yesterday? also has some great (though not earth-shattering or angsty) coming out scenes (made more realistic by the fact that Shirou has come out multiple different times to different people).

Koimonogatari (TAGURA Tohru) also has a pretty low-key/sweet coming out scene.

Miyamoto Kano is often praised for her realistic portrayals of gay/bisexual men, especially her Hydra/Rules series. I find her stuff tends to be slightly too angsty for me but your mileage may vary, and all that.

Welcome to Room #305! is also pretty great, but it's not BL, and focuses more on the straight roommate (learning to be not homo/transphobic) than the actual queer characters, though they are a significant part of the webtoon.

Thanks you very much!!!!
I'll start reading now...

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"The world is a dangerous place to live, not because of the people who are evil, but because of the people who don't do anything about it." <BR> - Albert Einstein

Otouto no otto is very interesting and has some quite unexpected coming out scenes.