The Rise of Isekai BL

* Transported into another world

"Kouichi starts his day off leaving school with a big farewell from his other club members. When he gets home he hears a voice calling to him, next thing he knows he is surrounded by gians. One of whom declares that Kouichi is going to be his bride."

* Transported into another world? [COMPLETED] + [SHOUNEN AI]

"Yuri Shibuya was living a pretty normal life. That changed the day he was dunked into a toilet after an attempt to save a classmate from a gang of bullies. Instead of just getting a good soaking, he's pulled in. The next thing he knows, he's in a world that vaguely resembles medieval Europe. If that's not odd enough, he's told that he is to be the next Maoh (King), just because he has black hair and black eyes."

* Transported into another world [COMPLETED]

"Yuta is Yasuda Yutaka who, on his way home from work, accidentally goes through a portal which suddenly appeared before him. On the other side, a completely different mysterious world! It's been five years since then and he still hasn't figured out the way back. To earn a living, he opened an okonomiyaki shop which is doing really well, so he's also getting used to life in this world. However, he has a problem. Many suitors come

* Transported into otome game

"College student Otonari Otoya is a boy who lacks self-esteem and dreams of being reborn into a different dimension. One day while playing a [video] game, he accidentally clicks on an ad, and trips into another world?!?!
He's surprised but delighted, until he realizes that something's strange. A whole group of guys are treating him too kindly, almost like he's a girl! Could it be that the world Otonari was transported into... is an otome game?!?!-"

* Transported into an otome game

""I'm straight, so why would I be entangled in this mess with three male suitors?!" Because of an obnoxious ad for a game, the main character, Lu Xing, accidentally enters the world of an otome game. In order to return, he must gain the affection of three male characters?! The aloof lord, the mysterious assassin, the gentle royal guard -- who will be his final pick? The survival of a straight man begins now…"

* Transported into another world [COMPLETED]
NOTE: Spin-off of number 11 in this list (Trip Lovers)

* Transported into another world

"The second generation of gangland time-travelled as the pirate king's son in Galaxy. And the pirate king was just killed. Well I thought that in the world I should have some special ability or power, make money and live a rich life again. But since the eggs I saved accidentally hatched, it seemed that I not only have a dragon but also a husband? No no no, I like girls obviously."

*Transportation to another world
NOTE: PURE PORN NO PLOT

* Transmigrated into a novel character (I think)

"An Internet troll who wants attention writes a bad comment criticising his favourite novel which the author sees and changes the plot to a darker plot. Somehow, he gets isekai'd into this novel world??"

"A Company President diagnosed with cancer accidentally transmigrated into a novel, and became the villainous emperor the male lead is going to kill?! On top of that, this male lead is the prince of the enemy kingdom that is being imprisoned by him at this moment…. Feels like he just took a step closer to death! No way! In order to live, I must please him, but I never knew that it wasn’t just simply hatred between us…."