[From Essence of Purity]:

chapters 1-5: At 23, Nagamori Kasumi is the new employee of a model agency but his cute face makes him look much younger than his real age. The most famous Japanese model, Nishimuro Shiki, works at the same agency... He is the so called Cinderella Boy. But he is in fact an 18 year old kid with a pretty harsh personality who drives all of his assistants away one after the other. Having enough of his constant whims, the manager tells him to choose up his own assistant. And Shiki decides to pick Kasumi...

Chapters 6-?: The Clearing of Rain
Hiyama pays a long haired boy for sex and falls in love with him. That's why the next time they meet Hiyama refuses to pay and the boy is insulted and runs away. Will they meet again?

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From Storm in Heaven:

Deep in a cave lies a demon trapped in ice who will eat any human who dares enter. The demon, Blood, waits for the human who will cry the purest tears, for the gem formed from those tears will break the spell that binds him. Then one day, a young man named Ishuca appears in the cave - and knowing that his weak heart will not last long, he has come to die. Touched by Ishuca's gentle nature, Blood gradually begins to change from the cruel, ice-cold demon he once was.

In the beginning, there was a demon in a cave: Blood, trapped in ice for many decades. In order to break the curse that bound him, he searched for the "tear jewel". One day, a youth called Ishuca appeared before him. He was suffering from an illness, and had come to the cave to die. Blood was touched by Ishuca's kindness, and began to feel drawn to him. However, death soon came to Ishuca, and, saddened by the death, Blood began to weep. His tear became the "tear jewel", and Ishuca's life was saved through its power.
The two set off on a journey. On the way, Blood was reunited with some old companions, but - since the demons wanted him to return to his old self, and Blood wanted to continue to travels with Ishuca - his former companions became his enemies. Upon confessing his own past to Ishuca, Blood promised never to kill another human. Having completed their journey - and with the aim of finding the jewel that Wild, the jewel-dealer, had asked for - they find themselves at the Toei Cliffs...!?
(Source: Essence of Purity)

Rakan lives alone, and the plants in his garden grow so thick and fast that it seems like a jungle. One day a man, holding a gun made of wood, falls right down into his garden. He seems to come from another world, and he's searching for someone who can bring back the green into his own dark and inhospitable world.

-- Storm in Heaven

Little side stories with the characters from Shuuten Unknown.