This manga was released on Twitter by Yamamoto Souichirou.

1st year high school girl Hyoudou Kudoki loves cute girls! But she's not good with 3D girls relationship, instead, she withdraws herself into her childhood friend's room and play Bishoujo Game every single day, but then, a smartphone app she got one day has dramatically changed her entry life!

From Girls' Generation Scanlations:

High-school student Subaru wouldn’t reject a sexual favor, but dating is out of the question when he’s not in love. Stumbling upon a beautiful painting in school, he knows he’s found his first love – the artist behind the work. But winning the heart of his love interest isn’t going to be easy, particularly with his promiscuous lifestyle…

Go Siwon's dreams are constantly visited by the clever, beautiful Kang Jinha. In the dream, Jinha keeps on mentioning this "incident" that happened between them but Siwon can't remember anything! And how can it feel so real? Luckily for Siwon, hints about the "incident" start to appear and Siwon is able to regain his memory bit by bit. How will their relationship change at the end of it all?

In a swimsuit, a bunny girl, and clothes that kill virgins.
A little naughty anthology comic of girls in various situations and costumes by 9 writers!

Misunderstood in the dark, Na Na "saved" a girl from a "pervert." Now he has his eyes on her. He brought her many troubles continuously at school because he is a "hot boy" many likes. Now, Na Na is determined to get revenge, but maybe she met her match...

Infront of proud and proper Tom, Jaemin often ends up acting stupid. Sigh, when I look at you, why do I become so shy?! The fun of sneakily reading up on the sweet and affectionate couple that decided to lived together.

Reset,
and game set.

When I opened my eyes, I was in a different world.
I had become the game's villainous princess who was feared by all.
Not to mention... Completely naked men I didn't even know were approaching me left and right!

“Are you cold? Shall I warm you up with a hug?”
“Oh? Have you not had enough yet?”

Seriously, what’s up with this situation?
And just how the hell am I going to get out of this freaking game?!
Official Indonesian Translation: https://kakaopage.co.id/content/Terjatuh-ke-Permainan-Harem/3399
Artist's Twitter: https://twitter.com/goya__0906
Author's Twitter: https://twitter.com/dailyinui

Itou-san is bored with her job. One day, she receives a letter.

From Decadence:

Mishima, a student at a school in the countryside, is bullied by his classmates. The reason is because he's seemingly gay. In reality, Mishima does like guys so he doesn't resist their bullying, and instead, finds solace in secretly cross-dressing. One day on the rooftop, Mishima finds the lipstick he'd lost before in the hands of Kirino, one of the bullies... and Kirino was about to put on the lipstick that Mishima used on his own lips. This is the story of young boys looking for a place they can really be themselves...

An ordinary middle school student works at the school infirmary with the crazy otaku school nurse.

A big junior is set on pampering her senior!? An uneven love comedy! ♪

About a mother who has lost her child and her former classmate. Going through her son's bookshelf, she has convinced herself that her son has reincarnated in another world and wishes to find a method to meet him, enlisting the help of her otaku classmate.

By chance, ordinary salaryman Hiyoshi ends up becoming drinking buddy to his admired senpai from work, Tsukizawa-san. However, all the drinkeres that Tsukizawa-san brings him to are weird places...!? An adult love comedy featuring drinking spots that exist in real life!

“Hey Kuroya-kun, do you like me?”
“How did you know!?”

Unrequited love. What a shame for Kuroya, a gloomy student in high school.
The other party is Kasumi Shiramori, a senior in the literature club and a transcendentally beautiful girl. While spending time alone in the club, I should have hidden this feeling for a long time…!
Senior told Kuroya in desperation.

“Then -? Want to try dating me first?”

There’s no way a relationship exists in the minds of these two!? No, wait, it should be like this-
Both the feelings and the super-sweet romantic comedy of youth are full of faintness in the misery of a longing senior who is teased despite being in a relationship!

That gloomy girl is so beautiful! Let's aim for it! A school romance comedy together with that reserved, cute girl as we try to stop being loners!

Author's Twitter: https://twitter.com/aconbwakame
Author's Pixiv: https://www.pixiv.net/en/users/1076594
Author’s FANBOX: https://konbuwakame.fanbox.cc

Aiko moved to Tokyo out of an adoration for Shinonome Shion, a mangaka whose work touched her so greatly that she reveres them like a god. What she doesn't know is that Mao, her lonely, gloomy next-door neighbor, is actually Shinonome-sensei herself. Their complicated relationship grows deeper as Mao tries to keep her identity a secret while struggling with the pedestal that Aiko has unknowingly put her on.

1-4) Friends Like a Lover (Koi Tomo)
Childhood friends Yukie and Kogawa are both in love with their other friend, Yamato.They relieve their unfulfilled sexual desire for Yamato by jerking each other off, but lately it seems they're progressing to something more serious... what will happen when Yamato finds out? Later on, a new guy enters the scene and he's also interested in one of the 3 friends. Will he be able to win his heart?

5) Love Plot (Rabu Purotto)
Kichii, Akira and Akira's older brother are models for Boyfriend Grand Prix magazine. Kichii made an unfortunate bet with Akira- if Kichii can outrank Akira's brother in the magazine boyfriend ranking, Akira will be his slave. Until then Kichii will be Akira's slave. Who will win? And why is Akira so determined to see his big brother beaten?

6)Loving
Tamura Chisato sleeps with just about anyone if they say they like him. Even though Masashi is straight, he finds himself irritated with the way Tamura acts and tries to change his ways.

Handsome and hardworking manager Oji has a secret. He is obsessed with "cute characters"! But… he can't exactly tell his subordinates that—(><)! A comedy centered around this "uncle's secret," which depicts the daily struggles of how he gets by in the world with his love of cute things. Where will manager Oji go tomorrow?!