A spin off from the main story.

Shinobu is a school girl that possesses the powers of an exorcist. She lived with her grandfather, who has died. leaving his church to her. It was her grandfather that helped her control her power in order to use it in service to the church. Now that she is alone, an uncertain future is before her. But wait, the new transfer student, Rihito Konoe, suddenly declared that he is a disciple of her grandfather's and that he will be aiding and protecting her. What is strange is that she doesn't remember her grandfather having a disciple. Who is this person really?

She has a secret little notebook filled with her goals and thoughts of him..?

1-4) Yuzu has never had any girlfriend in his entire life. So when he starts going to college, he vows that he will find a beautiful girlfriend. But instead, he ends up getting the unwanted attention of 2 guys who are serious in making Yuzu their own (respectively). And so, what happens next?

5) Kou invites Yuzu for a photography trip.
Not scanlated.

A series of "bishōjo"-centered manga booklets that were released weekly for a short time in Japan.

The manga would come packaged with a limited edition plastic-figure assembly kit, designed by Ohshima Yuki, of the featured character of the week:
Volume 1 - New! - Figure for volume 1 - Mion
Volume 2 - Two! - Figure for volume 2 - Ashita
Volume 3 - Hot! - Figure for volume 3 - Harusame
Volume 4 - Why!? - Figure for volume 4 - Sonome
Volume 5 - Bye! - Figure for volume 5 - Eruron
Bonus volume - eXtra! - Figure for bonus volume - Tetora

There is a conspicuous absence of the brothers (oniichan) of the title, as only the little girls are 'portrayed.

Amazawa Izumi and Mashiro Aya meet at the Amazawa Girls Academy. Aya was hired by Izumi's father to get rid of the "Midnight Ghost" a mysterious apparition which appears at midnight. Any girls who meet it fall into a deep sleep and won't regain consciousness. Aya gets on Izumi's nerves with her carefree attitude, but can they overcome their differences and be successful? What other poltergeists await them? How will their relationship develop?

A boy sleeps in on his important day. His head is filled with memories as he rushes to their meeting point. Will he make it?

1) The Restaurant of Many Orders (Soko wa Chuumon no Ooi Ryouriten)
A young woman frequents a certain French bistro. She would really enjoy the food they serve if only it weren't for the bossy chef owner. "You may not like me, but I love your food."

2) Invisible Girl in Love

3) Matryoshka
As each doll is opened up to give another one, so does each memory containing his feelings towards her.

4) The Selfish Couple

5) Drops.
A series of interconnected vignettes depicting how something as ordinary as rain can alter the course of people's lives.

N/A

Andou gets an envelope passed to him in class that contains an erotic picture belonging to Kagaya Jin, the mysterious half French transfer student. A short, bittersweet tale from the Meiji era.

High schooler Mao is excited for her first Christmas with her classmate and boyfriend Takeuchi. They have been dating since summer. And according to her friends Christmas is an event for first kisses...?!

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?