1-3) Zip Up Boy
High-school student Kazuki begins a casual sexual relationship with an older man after meeting in a bar. He becomes addicted to the affection but is perplexed by the indifference of his partner. Meanwhile, Kazuki's mother has decided to remarry Akira, the nicest guy you could imagine... unfortunately his brother Reiji just happens to be Kazuki's cold-hearted playmate.

4) A Dog and a Boy
An elementary school student falls for his neighbor's dog and gets himself invited to walk it every day... gradually growing closer to the owner.

Under Grand Hotel is the inmate's name for a prison in the US. Sen is a Japanese guy who has been imprisoned after killing his lover's husband. Sword Fish is the leader of the prison. Sen needs Sword's protection, but can a love story work in a prison?

Humanity has abandoned the earth and now lives in giant islands in the sky. The main character miss Nina hunts sky beasts with her talking cat called Cake. The defeated beasts turn into sky gems which are highly valuable items. Though when the ship she's on is destroyed by a massive sky beast it leads them to an unknown island with many mysteries.

From ADV:

Sakis, the Scion and Godslayer, gets entangled in a deadly incident when an unknown ship enters Lagoonarian airspace. After uncovering explosives along with the seeds of Abomination, Sakis begins a quest to uncover the mysteries surrounding the Ancient Gods!

Fantasy series of short stories that involves animals:

Pet Doctor Atsushi Kirishima meets a cat-guy with tail, cat ears and an injured eye when he is searching for his runaway patient animal. Atsushi can not leave the cat-guy and takes the guy to his animal hospital with him.

Hattori, an apprentice of Atsushi's father, Kenzou finds a dog in the mountains and brings it back in a car. On the way home the dog changes into a girl.

The titles stories are:

The Sounds of a Bell Can Be Heard
The Cat's Love
A Flicker of Light (two parts)
Amber's Diary (also known as Kohaku's Diary)
The Delicate Pair (also known as Every Subtlety)
(Black Cat + White Dog) > Human

Trouble Little Traveler
A cute unrelated shoujo short story about a boy meeting tiny aliens.

It's been a while since these two appeared, but from the one they'll pass on the baton...

From Wataame Shoujo: A collection of 6 stories about love relationships. 1st story: Emi has her first time with her boyfriend. She had heard that the first time would hurt, but she had no idea how much it hurt! After they first time she became afraid and began avoiding her boyfriend at all costs. But she still loves him. Will her love be able to conquer the pain of sex?

From Wataame Shoujo:
Yoo-i is a very special girl -- she's like refreshing and fragrant orange bubble gum... A boy appears all of a sudden and becomes a natural part of her life, as natural as breathing air... His name is Joo-in. He says, "Do you know nuna? Nuna is.. my past, my present, and my future... You are like this ladder connecting me to this world..."

Collection of Takemiya Jin's web-only oneshots, released on Rakuen: Le Paradis' website. All previous web extras are available as part of the Love & Piece series, published in Omoi no Kakera.

Shizuku has a unrequited love for Ichinomiya-sensei. But since Ichinomiya-sensei is her sister’s boyfriend, it’s a love that definitely won’t come true... She's trying hard to quickly find a new love, and she's been rushing to search for her soul mate within 10 years! When she went out searching for that fated person, she had a horrible meeting with Hatori from the tennis club.

From Condensation: Although Gyu Hwa Lee might look like a guy, she has feelings like any other girl. In fact, she's currently in love with Korean pop idol Kang Un Ryu. As luck would have it, Kang Un ends up transferring to Gyu Hwa's high school. The only problem is he has to keep his identity a secret so he's cross-dressing as a girl! What happens when Gyu Hwa discovers Kang Un's secret? Will she ever be able to win over his heart? Or will she always be nothing more than just a friend? A Korean manhwa with surprising poignance and refreshing humor by the author of Cynical Orange.

From StarryHeaven:

Hasato, finds love at first sight with the model “Peach.” She has entered the high school he attends just before the applications shut. But what is the truth about this “Peach” that she has met there…?!

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Based on the live action movie. Masaru Aso has gone missing from the public, due to being used as a genetic experiment by Doctor Mochizuki in order to create a perfect lifeform. Aso goes to hide in the forests from civilization due to his disgust on his "form" before he was summoned to save Dr. Mochizuki's son, Hiroshi, from being targeted by monsters from Neo Organism.

A gruesomely tragic, bittersweet story of a pair of orphan girls...

From Hoshikuzuu Scans:

The Kuga House is the most prestigious deer family in Nara Prefecture. Shiraha, their heir, is attached to childhood human friend, Sousuke. Shiraha is popular and loved by all, while Sousuke is a mere servant of the house. But he is always telling Sousuke how much he likes him. Even though he feels special to be singled out by the beautiful and esteemed Shiraha, he knows that there is a line that he cannot cross. But! During mating season, Shiraha can’t control himself anymore and he comes on to Sousuke! Since then, the scales of their well-balanced relationship tips and Sousuke’s virtue falls into danger!

Based on the Tokyo Grand Guignol play Litchi Hikari Club. Litchi Hikari Club revolves around a group of schoolboys who plan to create the ultimate in Artificial Intelligence. As the story progresses, we watch the group gradually fall apart due to internal conflict and as the boys, under corrupt leadership, involve increasingly more twisted and depraved methods to reach their goal. ------------- A group of nine boys (called the Hikari Club) are intent on making the Ultimate AI. The attractive leader of the club, Zera, is a twisted man polluting the minds of the club members to make them do whatever he pleases. Tamiya, the original founder of the club, wants to reclaim the club. Niko, the second in command, is pissed off at Jaibo, the one obsessed with Zera. They kidnap a schoolgirl, but the AI Raichi falls in love with her and she with him, and things get messy. (Warning: contains guro)

The "campus sword & sorcery" story is set in a private high school that brings together "saviors," youths with awakened memories from past lives. Some of them are Shirogane who fight enemies with weapons and techniques gleaned from the Prana powers from their own bodies. Others are Kuroma who wipe out enemies, with magic to manipulate the Mana powers that surpass physics. A boy named Moroha Haimura enrolls in this school. He is the first person in history with past lives of both Shirogane and Kuroma.

It was very hot. Hanzaki Koasa was locked in the car, and she was going to die. At this time, one man who injected her saved her. The injection made her special. Nine years later, another girl who has the same special ability appeared.......