A short side story happens during the 8 years time skip of the original Ultimate! Hentai Kamen

From Shoujo Crusade:

Kyouka, a sixteen-year-old, will be a winner today, the first day at the new school to which she has just transferred! She will definitely get a great boyfriend and say her goodbyes to those lonely days!! Kyouka has two brothers who love her a lot. Every guy who comes close to Kyouka is kicked out by them, thus she has no boyfriend. But she finally found an ideal prince... or that's what she thought. This guy, Maki, is actually a perverted prince!?

* Also includes two short stories in volume 2:

• Nanisama?! Oresama
Satomi loves Yuuya a little too much and is totally wrapped around his little finger. But, if this continues, instead of becoming his girlfriend, she'll forever remain his gofer. Will Satomi do something to find out exactly where she stands with Yuuya?

• Ijiwaru wa Kuchibiru
During Shiori's fifteenth spring, she fell in love with the idol Shuu Kitamura. She was even lucky enough to get to meet him in person, but she realizes he's nothing but a fraud! However, due to certain circumstances, Shiori becomes Shuu's personal assistant!?

From Which Scanlations:

With an unloving father who manages love hotels, an idiotic ninja "protector" named Jin who poses as her math teacher, and a history of getting into fist-fights, Ichihime's high school life isn't exactly easy. But when another girl at the exclusive high school sets her eyes on Jin, Ichihime might be the one in need of rescuing.

From Intercross:
It was just like any other day during lunch until today when suddenly the bishounen from my class gave me tiger-print panties!!?!

Haruka has a dog... A dog she ABSOLUTELY loves! Every single day, she gives him hugs and kisses~! Upon entering high school, she suddenly meets a boy...with the same name as her dog...looks like her dog...and acts like her dog in every way possible! Can Haruka resist the temptation of wanting to hug and kiss him like she does to her dog?

With 18th century Paris as the stage, in the age of automates, the city is attacked and put under siege by a maniacal Count and his giant automate. It's up to Jeep to take up her family's destiny and call upon the support of her imprisoned uncle to defeat the wicked Count before he destroys Paris and its people!

From Iskultrip:
Kaho is being bullied by another girl. One day, while walking to somewhere, she is approached by a man with a goat's head...?

Natsuo recently got a hot private tutor for his upcoming entrance exams. But there's something funny about Miss Hibiya that he just can't put his finger on. Miss Hibiya helps Natsuo on both his exam and his love life at school.

From Esthétique:

Non-chan has never been able to catch up to top stylist and childhood friend Omi. Following in her father's footsteps, Non trains hard at the Jisen Sougou Beauty School. Clumsy and headstrong, will Non-chan be able to triumph as a hair stylist and find love along the way?

From Aerandria Scans:

A cute, short oneshot about a man and a cat.

It's 3 oneshots linked by the common theme of gashapon and some of the characters being friends with one another and/or attending the same school.

• Love Gashapon
On the first day that Yuhan moved into her new home, she discovered a window in her room that looks across directly at a neighbor's window. From that neighbor's window a mysterious shadow lurks...

• Love Capsule Toy - Welcome, First Love
YanZhu is a very shy girl, who has always liked her senpai but didn't have the courage to confess. It isn't until Valentine's Day eve, after she bought a toy at Monmon's shop, that she finally got up the courage to confess, who knew...

• Love Capsule Toy - A Prince without the Glass Slipper
Zhou ZiYu is a playboy who has never refused anybody, so he has countless number of ex-girlfriends. He is this kind of guy, yet he meets his soulmate at a masque ball? This is the longest of the stories, has 3 parts.

From Evil Flowers:

A short oneshot about the Demon of Love; the Incubus who, in order to become a Full Demon, needs to feast on the essence of 10,000 women. However, the last woman he chooses is actually a boy?! So, the Incubus decides to live with the boy, until he has completed his quest to become a Full Demon. It’s not shounen-ai, just a comedy.

Haruka and Kanata's cousin Yuzu is coming to live with them, but she hates men. Enter Haruka's brilliant idea: Kanata should crossdress.

Setia is prisoner of Azurite, the tyrant king. She has a fiance waiting for her but the king seems to have taken a fancy in toying with her! But under his ruthless facade there appears to be...

Oneshot from Himegimi no Tsukurikata

Hisai Aoba, a 13-year-old male idol, is threatened to put off his upcoming stage performance. To prevent himself from danger, he hired a personal bodyguard, Tsukasa. At first, he thought that Tsukasa was just a taciturn and rude guy, but little did he know that...

Doujima Kenji and his friends decide to spend their winter vacation ghost hunting, however all but one of them cancel. Now, he finds himself alone with the girl he likes, and it turns out that there may be more to this ghost story than they had anticipated.

A one-shot manga. It’s an action/comedy story about a woman named Tyria who is a maid in disguise, but in reality she is sort of a counter-terrorism operative. It's up to her to stop a hostile takeover by pirates on an airship using only cooking items, like a frying pan, cutting knives and even a fork as apart of her deadly arsenal.

The story place between the first and second seasons. Fate is having some strange dreams product of the long exposure to magical girls anime and for being apart of her girl for too long.

The story is set in the year 2050, in a place called Sky City Tokyo. The main character, Park, is a window cleaner. If you've ever experienced those street windshield washers that descend upon your car when you stop at a red light, you can imagine what Park does for a living. Except worse, because in Sky City Tokyo, the cars travel in mid-air! How does a window cleaner become a hero?

Aotsuki has started working part-time at a cafe, but the boss there is kind of scary. His boss has asked him to help him out with his crush on an employee, the pretty Sonezaki Majiyu. Will Aotsuki be able to set his boss up with her, or will he face the dire consequences of his failure?