Compilation of short stories:

? Hotel: Since 2079 (2006)
It is the year 2272 A.D.

A computer continues to live on in order to complete a mission in a world where all life, including Mankind, has gone extinct. This is a record of those 27 million years of its heroic struggle.

? Present (2006)
Hanako suffers from a terrible disease. After awakening from a deep slumber, Hanako has only three days to live.

? Subete wa Maguro no Tame datta (It Was All for the Tuna) (2008)
Tuna have become extinct and Jun Shiozaki will do everything possible and imaginable to bring them back.

? Stephanos
Set in modern-day Japan, our main character Noriko finds out that she is pregnant with her lover Matsumura’s baby. He, however, is an important doctor with a family and everything already. Noriko wants to have the baby, but Matsumura says that it’s actually a rapidly growing cancer and that they have to remove it immediately. It might also be neither of these things…

? Diadem
A "Diadem" is a word for 'crown' that has its root in Greek. "Stephanos", which appeared in "Mandala" 01, was also a 'crown'. It seems that we could consider this the second work in a continuing series of shorts that should perhaps be called a "Crown series".

After Pickaxe moved out for Seoul he find a strange suit that allow him to become a the Dango Knight.
He'll come to face the hyper dangerous evil organization Dark Roach and its sexy leader...
(Source: MU)

A "Diadem" is a word for 'crown' that has its root in Greek. "Stephanos", which appeared in "Mandala" 01, was also a 'crown'. It seems that we could consider this the second work in a continuing series of shorts that should perhaps be called a "Crown series".

(From In the Water):

Hanako suffers from a terrible disease. After awakening from a deep slumber, Hanako has only three days to live. During those three days, her husband, Takao, must endure a heart-breaking experience.

The year is AD 2048. Japan is connected to the Eurasian continent by a transcontinental railroad. The capital, Tokyo, has become a crucible of criminals and terrorists. And so, in the metropolitan darkness a mysterious presence attacks and slaughters people, unnoticed, night after night... Just what are these "things that are not human" living in hiding in the human world? And just who is this "Origin" person who faces them?

(Source: MU)

To protect the earth from the "eques" and save the human race from an alien menace, the young Akira has to fight to the death. Even if that requires sacrifices...
(Source: Japanzai)

Follow the adventure of Caisar, the chef on the spaceship of Manado, a group of sexy monster hunters!

After being betrayed by his country, Jirou left his past as a hitman behind and came back to Japan were nothing mattered anymore in his eyes. But that's before he mets Nami, an active hitman seeking vengeance for her father's death. But not any hitman, a wallman! Jirou is then brought back into this world and teams up with her.

(Source: Japanzai)

Ken, a young Japanese guy, is in love with a young Korean girl Yumin. He followed her in Korea and wants to become a policeman just like her. But then, he finds himself at the head of a local gang. What will happen to Ken?

Included one-shot:
Volume 12: Trigun: The Lost Plant

Impersonate Kitano Ken to go on a date with Yumin and enjoy some of the specialities Korea has to offer.

What did humanity's final astronaut, Byakuya Ishigami, do when he saw everyone on earth turn to stone from the international space station? A special side story written and drawn by Boichi Sensei himself! The first simultaneous series and side story serialization in Weekly Shonen Jump history!

(Source: Manga PLUS

Our favorite sexy cop Yumin face the danger of drugs. Follow her infiltration and enjoy the (fan)service!

After a crazy night, a young teacher is tricked into becoming the father of two gorgeous young girls.

(Source: Japanzai)

Since childhood, Hiro has had the ability to see the energy of all things as shapes of little men. He now heads up a team that is charged with the hunting of next generation energies in order to save the future of not only Japan, but the World.
(Source: Chronowarp)