Story 1: Renai Joujou
Tsubasa, a normal teenage girl, promises to her dying grandfather that she'd fufill his last wish. However, it turns out that she must marry the heir of a tea ceremony school due to her grandfather's promise? What?! But, there are two heirs, so she must decide who to marry, or if to just run away from her problem.

Story 2: Ouji Sama no Himitsu (The Prince's Secret)
Yukasato happens to witness her school's prince, Matsunaga-senpai, rejecting a confession from a girl, and then freaking out by himself afterwards. Yukasato offers to be his girlfriend to help 'rehabilitate' him of his fear of girls...

Story 3: Rabu✩STAR (Love✩Star)
Ito and Kaho are childhood friends, Ito being the tyrant who bosses Kaho around, and Kaho complying (mostly because his mom asked her to). Ito is a star, but Kaho doesn't see him that way until he drags her along to a photo shoot of his...

Story 4: Chuttoshite Purisu (Kiss Me - Please!!)
Hinata and Jun have been dating for three months, but haven't kissed yet... Hinata discovers that Jun faints whenever he gets close to kiss Hinata!

From Shoujo Crusade:

It has been many years since the Taisho era. The daily private lesson life of a merchant's daughter, Aoi and a fallen noble, Reiichirou unfolds...!?

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Story from the cover of the manga:
Many years have already passed since the Taisho era began. Sonomiya Reiichirou who is a fallen noble turned tutor, and Maruya Aoi, the daughter of a newly rich dumpling seller, start this wonderful Taisho romantic love story. Reiichirou gives Aoi-sama strict and attentive lessons to help her become familiar with being amongst the rich and the powerful! However, when night falls, the lessons quickly change to private lessons!?

A special chapter was published in the 13th issue of Hana to Yume in 2011.

From Horobi no Michi:

Kirisaki Fumio's just a highschool girl in love...

...but then she finds out that the guy she's fallen for happens to love someone else.

...so she decides to go out and get a chainsaw.

And take it to school.

And then many things happen.

In the Renai Chuudokuteki Senjutsushi series: 1. Senjutsushi wa Kujikenai - Renai Chuudokuteki Senjutsushi 2. Senjutsushi wa Koi ni Oboreru 3. Senjutsushi wa Netsuai Sareru 4. Senjutsushi to Majin no Shiro 5. Senjutsushi to Fukushuu no Koto 6. Senjutsushi to Saiyaku no Tsubo (1) 7. Senjutsushi to Saiyaku no Tsubo (2) In a certain time, in a certain land, there was a beautiful magician with long, trailing silver hair. His name was Liu Li Xian, a man whose beauty was so great and his magic so powerful, others believed him to be not of this world. However! He had a certain "illness." Which was that he really, really, REALLY liked pretty men. He found them IRRESISTIBLE! Liu Li Xian's grand adventure in seeking out prospective lovers begins!

N/A

Tokiwa Kanenari likes to masquerade as a substitute science teacher, but he's actually in the business of dealing with the spirit world. And there are spirits in all sorts of things around him, from amber necklaces to unfinished paintings and even abandoned satellites.

The manga inspired TV drama series broadcasted in 1991.

by Nornir
Gray Town – where all the buildings are gray, except for one single house, built who knows when - the Red House.

A collection of one-shots:

ch1) Kuchibiru Mellow (formerly known as Bisque Doll Replica)

ch2) Hachimitsu Neko

ch3-4) Mishitsu Funny Romance

ch5) Ningyo no Iru Keshiki
A guy falls in love with an aquarium diver at first sight, and he does his best to court him.

'Once noticed, it was...'

From the 1st year of middle school to the 2nd year of high school, Makihara Kai and Mizushiro Ren have been in the same class. But in the last year of their high school lives they are placed into different classes. A small ripple is born in the unchanging days that pass by... that makes the feelings they were unaware of start to bloom. Wanting to tell him, but unable to say it. The answer deep, deep within their hearts is...

The path of youth and high school boys unable to voice their love.

From Aerandria Scans:

Hinako is the perfect high school girl. She’s beautiful. She’s graceful. She’s exquisite like a doll. She can be compared to a delicate flower. Oh, and she also beats up delinquents and perverts in her spare time. Does our delicate rose just like beating up people or is there a much deeper reason?

A spin-off from Houkago Play, this time it's about two girls who talk about their sex life, boyfriends or being a fujoshi.

N/A

Sequel to two series:
Mizuiro to Pinku, Sore kara Daidai (by Munya Munya Sue (OGURA Muku))
Yumegiwa Sweet Bedroom (by Munya Munya Sue (KOBATO Mebaru))

Because his friends fired a rocket into the US Army camp, Suzuki was wanted by the US Army and the police. While he was running away the sea surface suddenly rose, and when a brilliant light appeared he saw a strange looking battleship flying in the air. He was dumped into the sea and when he crawled onto the battleship there was a beautiful girl standing there. She said her name was Lyx, the princess of another world, and added; "My Father is Japanese, Shinjiro Sakomizu. Please help me, Suzuki".

N/A

One day Sa, a person who refuses to believe in fantasy, sees a pretty girl floating down from the sky. His peace is quickly shattered and he is brought into the world of "Christ" and "Apostles". However, the twist is these "Apostles" are fighting for their lives (and they're girls, not to mention). Who are these "Apostles" and what are they fighting for?

from u-zai:
I was reunited with an acquaintance from my college days at work. If I were to listen to him, he made a career in showbiz based on nothing but lies. So we had sex like he was using it keep my mouth shut, and just like that we became sex friends…

The legendary school horror manga has been revived! Girls go hunting for mermaids to win their true love. Featuring very untraditional mermaids.

A parody of 19th-century romance, starring an eccentric Indian prince Rashanu (who also appears as a supporting character in Patalliro! by the same mangaka).