A direct sequel/side story to Himitsu no Kaidan.

Akira always recklessly runs head-first at any problem. Having just transferred into Nanjou High's part-time evening classes, he picks a fight with the full-time students' baseball club, a favorite for Koushien who are monopolizing the playing grounds. In order to challenge the full-time baseball club on equal footing, Akira will aim for Jinguu, the home of "the other Koushien" for part-time high school students!

Volume 2 includes the oneshots Inochi no Mound and Mou Hitotsu no Koushien.

From Yen Press:
Kyon is your ordinary high school freshman who has long given up on his childhood dreams of encountering the fantastic and supernatural, or so he thought.
From the very first day of school, his classmate–the beautiful but eccentric Haruhi Suzumiya–makes it very clear that her only desire is to meet aliens, time travelers, and psychics! A chance conversation between the two inspires Haruhi to form the SOS Brigade, a school club created for the sole purpose of getting these supernatural beings together. The initial members consist of the mute bookworm Yuki Nagato, the timid but voluptuous Mikuru Asahina, and the polite and ever-smiling Itsuki Koizumi. By the end of this first volume, Kyon quickly finds out that these seemingly “helpless victims” of Haruhi’s are actually members of secret organizations–both futuristic and alien–keeping watch over Haruhi as she is the pinnacle of some major calamity on the horizon.

Mizutani likes Kikuhara, but she isn't able to tell him how she feels. As she wishes for her to be able to go back in time to start over, she. one day, finds a phone that coincidentally belongs to Kikuhara. The phone recieves a message and says: To the person who picked it up, please send me a reply using the address or number below. Mizutani sees this opportunity to start over with him and decides to disgueses herself as Endou who doesn't really have many friends and wishes to be his.

Distance with girlfriend: 3m behind/in front!! Only his appearance is like a carnivore, what will his destiny be?

From Kawaii Corner:

On the first day of high school, because of a conditioned response, Kunie Hokuto injured Yachigusa Shissa, the disciplinary committee chairman feared by students throughout the school. He listens to Shissa's remarks and agrees to be appointed to stay with him as his servant, in compensation for the injury. In addition, without knowing why, he is designated as a first-year representative to the disciplinary committee, but the disciplinary committee vice chairman, Shissa's younger brother, Zento, declares, "I do not approve"...!?

Konatsu Moa has been asked by the teacher to deliver the lecture notes to her mysterious classmate Yamada Kei, who hasn't been to school. Her childhood friend, Kisaragi Miyabi, decides to accompany Moa to Yamada's house only to find out....he's an otaku?! Their first impression gets even worse when he says some rude things to Miyabi. Will this unexpected encounter be start of the three's spring and romance...?

In these super ordinary days something unexpected happened?
Mirutsuki is shocked when Fujiyama suddenly approaches her with an unusual request: The smartest, most popular guy wants to observe her, the most average girl? What could be the reason for his strange behavior?

We have been together since childhood, and even now we are still close friends. I have always loved you but now that you are leaving me behind, what do I do? ------------------------------------------------------------Spanish/Español:ESP - Hemos estado juntos desde la infancia, y todavía ahora somos amigos cercanos. Siempre te he querido pero ahora que me estás dejando atrás, ¿qué hago?

From Shoujo Sense:

Sono wants to change, so she can get a boyfriend in high school. But sleeping in and late on her way for the opening ceremony, she runs into Aona, who wants to change too. Will this fateful encounter ruin(?) Sono's chance?

From Transient Mirage:

Hina Nobara is a girl from a good family who is the student morality officer for her school, the private Matsubase Academy. One day, a group of four sexy guys from the neighboring delinquent boys high school suddenly appeared before the sober and serious Nobara. They were incredibly attractive, but they were also the worst sort of people. Will they keep the innocent Nobara on their hook!? Good-looking and thrilling! This school diary of swoon-worthy gorgeousness and passion is beginning!!

From TCMANGA:
Emily, a 23 year old woman, is a teacher at the local high school. She's smart, attractive and put together--well it would appear that way. What has been kept a secret however from everyone else is that she is actually married to Shishio--an 18 year old student in her class. Lots of hilarious circumstances ensue along with some romance and some real life issues between the couple.

The prequel book Atashi no Lion starts the series, and then it becomes My Darling Lion and continues on for 10 volumes.

From Delish Scans:

Love blossoms in your face.
----------------------

One day in summer, the 14-year-old Maiko starts seeing flowers instead of heads on people in love. Nobody else seems to notice, not even her close childhood friend Ichi. What will change for her?

From Shinnen:

Isezaki, a second year from Kamiyama Boy's High, has had his heart captured by a girl he saw in the window of the neighbouring girls' school. A school route madonna!! After two months, it's time for her to graduate...?! It's a 17-year-old's summer starting from spring, chockful of idiocy and friendship enough to make you cry.

Also include is an extra story called Fuyu Hodoki in volume one.

From Shoujo Addiction:

1) I'll definitely obey You!!
Nanase Reika is known as the queen at her school. She doesn't take any orders from someone but when Akimoto Kaito, her teacher, transformed from a nerd to a hottie and ordered her to lick him clean after spilling juice on him... she suddenly followed him! What will happen to the relationship of these two?

2) Treatment for Love

3) Honey Boyfriend

4) Surround Me Affectionately

5) Mousou♥Fuuki Iin

6) Honey Boyfriend - Extra

• Adorable to Me
A girl stumbles onto her school's art club and decides to join so the club won't be shut down, only to find herself falling in love with the club's one other member.

• Delicious Time

• Spike Girls

• Seiippai no Suki to Uso to (All My Love and Lies)
About two girls who are interested in the same upperclassman.

• Always
Retells the events of "All My Love and Lies" from Rinko's perspective.

• Sweet Sweet Sweet

• Worrying is an extra for Adorable to Me.

From Lililicious:

A sci-fi story set in a future where men have died off. Women have been divided into two groups: Adams and Eves. Each has a set role in society. The protagonist, an Adam, has just entered Kingdom Academy. Romantic relationships between Adams are forbidden there, so I'm sure you can all guess where this is going...

A collection of connected standalone oneshots by Takemiya Jin.

Includes:

Truffle Nature
Thyme Orange
Sweet Acid
Best Friends
Good Faith
Be Connected
Hands
Be jealous of
April 2/3
May 3/3
tee hee hee
July 1/3
3/3 Memories
Happiness

Abiding by his father's will, Shougo was transferred into an academy where many young girls attend. It appears as though his younger sister (separated from him at birth) also attends this academy, and that she is trying to get closer to him without letting know him who she actually is. Problem is, Shougo seems to be popular with the other girls as well! Can Shougo "properly" reunite with his little sister and while making a girlfriend at the same time?!

From Shoujo Crusade:
Haruse Yui ends up becoming the new landlord for her grandfather's apartment. But it's no ordinary apartment because all the tenants wear glasses and thus it has been dubbed the glasses apartment! Not only that, the tenants aren't what they seem?

Also includes:
Otokomae!
Dakara Suki to ka, Kirai to ka
Ojou-sama’s Clinical Records