Seto is a serious kid who leads a quiet High-school life, until he starts to get teased by resident Gal Anjo.

What should I do to become an adult? Akane Amou, who grew up with her parents forbidding any kind of entertainment, is a little bad with "stimulating" stuff, to the point she can't even watch a kissing scene in a drama. Now that she’s a highschool student, she somehow wants to overcome it! Those are her intentions, but it’s not that easy. Meanwhile, she got acquainted with a movie otaku named Fuyumine. Will she be able to watch an R15 movie…?

An 'apocalyptic' boy-meets-girl rom-com about high school boy Yutaka Kuromori and the beautiful, popular girl adored by everyone, Aru Hoshina. Yutaka might shyly deny it, insisting “we’re not dating”, but Aru is always clinging to him, and the two are seen as the talk-of-the-school couple.

But behind what looks like an ordinary boy–girl high school relationship lies a secret — one so ruinous and capricious that, if mishandled, it could bring about the end of the world.

Youth romcom about 4 sisters who are all experiencing their first love at the same time. While the eldest is having a crush on the guy at her part-time work, the other three are dealing with their first romantic experiences with boys in their classes and school clubs. Every night, the four have heart-to-heart girls talks as they navigate their respective first loves.

I don’t need any deep relationships. I have no desire for a girlfriend, and I only require one friend who holds any value to me. Ever since I threw out my youth for the sake of efficiency, there is one person who keeps entering the bedroom of Ooboshi Akiteru. She’s neither my little sister nor my friend. She’s nothing more than a bothersome, annoying Kouhai, as well as my friend’s little sister: Kohinata Iroha.

“Senpai, let’s go on a date~! Did you think I’d say that~?”

Rather than blood, it seems like energy drinks run through her veins. She keeps occupying my bed, and she tries her best to seduce me with whatever method she can play to her favor. She’s a girl who’s constantly annoying and obnoxious around me. Even though I’m busy all day long, she doesn’t care.

And in case you’re wondering why all these envious gazes are directed at me, it’s because Iroha is actually really popular. She’s an honor student at our school with top grades to boot, and she’s known for being kind and proper to anyone she meets.

…Hey now, why are you only so annoying when you’re around me?

Misaki-kun may be adorable, but he's just the 'best friend' type character you can find in any gal game. However, the protagonist, Kihara Hareta, isn't set on wooing any of the heroines; he has his eyes set on the Unobtainable Misaki-kun! Gender makes little difference in the face of such cuteness in this heart-stoppingly sweet comedy!

Hinako, a friend of Asahi's older sister, is a frequent guest at the home of the high school boy. She always misleads his mind with her suggestive attitude while treating him like a little brother...or rather, pet? A love story between a gal who has a bugged sense of proximity and an otaku guy who acts like her parent!

From MangaHelpers:

This 4-koma comedy manga follows the daily life of the intelligent, responsible 6th grade elementary school student Haruna Raika. She keeps busy as the elementary student council president and the classroom leader, and she even fills in for the teacher sometimes! [tethysdust]

-------------------
4-Koma comedy following the super genius grade school student Haruna Raika and her every day life. Where she's the class president, the room leader, the top student, and even fills in for the teacher when they've overslept!

From their worst encounter comes a story about their ultimate happiness! This romantic comedy explores the ups and downs of a serious relationship.

In the summer of his second year of high school, the protagonist, Yuushin Tahara, finds that his childhood friend, Miyu Fukagawa, who had moved away, has returned to the house next door. Although Miyu has grown up to be quite cute, there's something a little strange about her... This is a fresh and suspenseful romantic comedy about the gentle protagonist and his cute but rather quirky childhood friend, along with their friends and the adventures they get into!

Meirin, a junior high schooler, is the real identity of the famous "Dr. Rin" who heads a very popular feng sui website. She is in love with her best friend Asuka, a member of the soccer team. "Dr. Rin"'s advice has granted success for many, yet Meirin's own love life doesn't seem to be going too smoothly?

An earlier work by the mangaka of the popular "Beauty Pop"!

A certain boy and girl in middle school became lovers, flirted with each other, disagreed on trivial things, became more frequently irritated with each other rather than excited… and ended up breaking up on graduation.

And so, the two of them, Irido Mizuto and Ayai Yume, wound up meeting each other in the most unexpected fashion.

“Isn’t it obvious that I’m the elder brother.” “Isn’t it obvious that I’m the elder sister.”

The children of the partner of their parent’s remarriage was their ex-lover!?

The former couple, mindful of their parent’s feelings, decided on a ‘sibling rule’ where the one takes conscious of the other as the opposite s*x loses, but—

When they encounter each other in the bathroom, commute to and from school together… along with the memories of the past and living under the same roof, just how do they disregard each other!?

Alba is happy living a quiet life deep in the mountains... until the day he accidentally saves a beautiful girl — an act that shatters his plans completely. As fate would have it, this girl is one of the key characters responsible for his death in the game's original story! Now dragged into the elite academy where the game unfolds, Alba must dodge danger at every turn if he wants to stay alive.

"If you were to disappear... I might just lose myself."

Arcs is reborn into the world of the wildly popular otome game Celestia Kingdom. He thought he was just a background character—until it's revealed he's actually the childhood friend of the final boss! Determined to avoid the bad ending, he throws himself into his daily life as her servant. But it seems the true cause of her descent into darkness is... her childhood friend!?

An unpredictable tale of master and servant, between a slightly (maybe more than slightly?) yandere heroine and an obliviously overpowered protagonist, begins...!

Description from GANMA! :
Yuusuke, a 7th grader, is interested in his friend's older sister for various reasons.
The older sister, while a little strange, is a kind and caring girl.
She's mysterious, but is popular with everyone.
This is an ordinary comedy about Mayuri-san's mysterious everyday life.

Author/Artist’s Twitter: https://twitter.com/panzuban (Though it seems they do not/have not posted much about this comic)

Youth = friendship, effort, and future prediction!
A very ordinary and supernatural daily life sent by the strongest and invincible gal with different abilities.

- Official YouTube: https://www.youtube.com/@parako
- Official Twitter/X: https://twitter.com/parako_official

Botan Ichige has just enrolled in St. Asmaria All-Girl's School where angels are said to live. It turns out that angels do indeed live there, and after an accident, an angel named Un offers Botan her halo as a snack. After eating it, Botan discovers it had some bizarre side-effects, causing her to regularly "give birth" to colorful mushrooms. Is this the life of an angel!?

Nagi Shinonome, known as the "Ice Princess," is a beautiful girl with a cold attitude who does not allow others to get close to her. One day, Souta Minori, who saw her being molested on the train, saved her with all his courage, but the next day she appeared again and said, "I want you to stay by my side." Can Souta continue as friends with the Ice Princess, who only sweetly melts for one person in the world, that is, himself?

Choose the world or choose her.

Ordinary high school student Shiraishi Godo harbored a "secret" - he possessed memories of a past life. In a world different from this one, he was a "hero" who saved humanity.

However, that was a story of his past life.

In this life, he was supposed to lead an ordinary school life—until the arrival of transfer student Mai Shiina turned everything upside down.

People say that the youthful days are always bittersweet, but maybe it's just bitter? Kyouko Hori is a flashy high school girl, who, despite her ostentatious appearance, excels in academics and has a family-loving character. Izumi Miyamura is a bland high school boy, who, despite not wanting to stand out in class, secretly wears piercings outside of school and has a large body tattoo. One day, Miyamura finds Hori's little brother injured and helps him back to Hori's house, where the relationship between Hori and Miyamura begins with Hori's discovery of Miyamura's secret.