Yume no Shiro is a one volume work by Masami Tsuda and consists of 3 short stories, that were drawn while Kare Kano was still running.
It's all about love couples. Also, there is a thread running through all three stories. That's a magician who helps the people. Who are the people he helps?

1) Inside the Forest
Sana loves the forest and is friends with the animals. However she is a noble's daughter that has been recently requested to be a concubine for a king due to the death of his previous concubine. Unwilling, she becomes his concubine, however she seems to have fallen in love, but he only loves his dead wife...

2) I'm a Mermaid
The island priestess discovers a golden-hair, blue eyed man that seems to be an enemy. However both fall in love...

3) The Castle of Dreams
Lord Lafense has enough of his life and decided to commit suicide by jumping off the castle wall, but it seems that his faithful servant Chita is dragged along with him. However, when they woke up, they found freedom in a dream-like castle. Are they really in the afterlife as they thought or is it something more..magical?

A nightmare-devouring tapir becomes stuck in Akane's dreams until she can feed him a proper nightmare.

Compilation of short stories:

1. Rabu. Sutori Ichi Musu (Love stream)

2. Wandering

3. Tomadoi
A mangaka falls in love at first sight with his new assistant editor. The mangaka's assistant who was a classmate of the assistant editor tries to be their cupid...

4. Fighting Love 20 Years

5. Fighting Love 2000

6. Refrain

7. Drifting and Whirling
Hero regularly dates with a younger and rich office worker for money! But soon, he can't keep such an unfaithful relationship...

8. The Miracle of Christmas
A homosexual college student who is working at a convenience store falls in love with his colleague, a heterosexual and gamblesome high school graduate. Hero keeps pretending to be a good friend but soon he can't anymore because the colleague finds a girlfriend. Then another colleague, a very fat boy who has a steady girlfriend tries to play cupid...

Extra

From FCTranslations: Azuki, a young girl whose father is the president of an entertainment corporation, is always out of luck when it comes to dating. It seems like every boy she had dated before all tried to use her as a bridge to get into the world of media. So when Azuki met the guy of her dreams, who also happened to be a contestant in the audition her father set up, she wasn't so sure what to do anymore. *Contains in the 4th volume, Juliet Club: An idol in a famous group tries to escape from his fans by studying in the library. There, he meets a girl who he mistakes as one of his fans and tries to send her away. It turns out that the girl actually doesn't know that he is an idol. They continue to study together in the library, neither of them knowing the other's name, while love slowly blooms between them... *Also another story titled We, the Demon, and Christmas Every year at the time of Christmas, the demon appears, and the Angel twins intend to catch him.

Coming in an omnibus form, it's a side story of Toribako House! The words you longed for, the many things you held dear, everything and everyone, right here!! A girl who has no luck with guys, a weak-spirited otaku boy, a natural lady-killer, a middle-aged couple, a distant relationship -- everyone keeps looking for happiness!?

Stories from the Oniyuri Hot Spring, a no-name hot spring which slowly starts to gain fame as more women come to visit.

Interlinked stories.

1-4. Bukiyou na Bokura no Sukima
5-8. Sweet Crazy Days

The misadventures of a high school hockey club featuring a student who has returned from Japan after playing hockey in Canada.

Naoto has just discovered that his grandfather was the head of Kurusu family. The old man's will states that he wants Naoto to take over the family and businesses, but this is the first Naoto's heard of any of it! If Naoto accepts his life will change forever and guardian Iori Kazuki swears he'll protect Naoto with his life...

A collection of one-shots. The first one being about Nanami, a college student addicted to sex,who is called out by one of his many sex friends, the arrogant Kazuma. When he goes to their rendezvous place he's shocked to discover a second Kazuma! It’s actually Shoma, his twin brother... Three other stories: "You are my number one", "Kiss me again like that day" and "A love in two dimensions" .

From Peccatore Sanctuary:

Prime Minister, Kanata Okazaki's SP (bodyguard), Ryouichi Makita, falls after covering Kanata from a bullet. As his conciousness fades, what came back in Ryouichi's mind was his high school days -- when he first met Kanata, who pierced him with his unforgettable eyes....!!

Yugo Beppu is a master negotiator and mediator. Fluency in five languages, Socratic wit, and a deep understanding of human nature combined with top-level international connections make him a formidable operator.

Collection of 4koma comics based on the Persona 4 game, made by various artists.

Sugiyama Rika is the Chief of Public Moral in her school and dislikes the school's student body President Jinguuji Kasui. She thinks he's incompetent and an expert at lying. One day a rumor broke out about a myth about love in their old school building, suddenly Rika finds herself entangled in the love myth with none other than... Jinguuji Kasui?!

Gi Yuh is the leader of the strongest gang in his high school. He lives together with his younger sister, who seems to love him.
When saving the beautiful Ha Na from a truck he instead gets injured and lies in coma for two weeks. During these two weeks he dives into a strange dreamworld and after his recovery he is not the same anymore. He regularly dreams about what seems to be a past him. To find out what happened to him he asked his teacher for help, who has friends, who deal with fortunetelling and supernatural powers. Here he finds the answer to his strange condition: He is supposed to be a "higher ghost", who takes the position of a dead or soon-dying person.

I accidentally summoned my ancestor! How do I return him safely...!?

The one-shot opens with two slightly different members of a yakuza group talking together at a family restaurant. The yakuza group is in the middle of a dispute, and some members visit a young man named "Damiyan" who has a mysterious power.

From Bunny's Scanlations and Must Be Endless:

One day, up-and-coming young photographer Franz Schumann makes a fateful encounter. A beautiful young man with jet-black hair, eyes that show traces of a fresh grief, white skin like porcelain that, though it’s decorated with numerous bruises, is still sublime: Jay. He won’t tell the whole story of where he’s from, and Franz, wanting to keep the mysterious Jay as his exclusive model, as time passes, begins to fall in love with him...

Amano works in a hotel that caters to visitors from the other realm. When Tsukiyomi, the king of the other realm visits the hotel, Amano discovers the truth behind the disappearance of his childhood friend, Mitsuki.

Note: Polar Night is a reprint of Mangetsu no Ou, but with corrections, 36 additional pages, and the inclusion of doujinshi the mangaka wrote after the main story was first published. However, it does not contain the unrelated oneshot, Jet Leg, which is included in the tankoubon for this series.

In the middle of a high school assembly, all of the students suddenly collapse. The one behind it all is a girl named Mao who holds a grudge. She's out for revenge against the entire school!