Follows the game story.

Fujidou Sayaka is the granddaughter of the famous detective Fujidou Souijirou. After her grandpa passed away, he stated that Sayaka can have his one million yen with the condition that she must work as a detective at her grandpa's agency. Or else, the money will go to the Tsurukamei organization.

Reiki, a 12-year-old boy who has been living with Sayaka's grandfather for 5 years, is now Sayaka's assistant. As pretty as Sayaka is, she's also very arrogant and doesn't like this job at all, and most importantly she often bickers over Reiki. One thing that they both didn't know at first place is that Reiki's innocent face is just grandpa's trick to seal Reiki's true personality - a cold and violent boy. And most importantly, the key to unlocking that secret turns out to be Sayaka's hot naked body!

From the back cover via Manga Abyss:

"My inheritance is a company that rents out magic users...what!?"

The extremely scared Iba Itsuki receives his inheritance left to him by his missing father: the Magic User Rental Company Astral. The magic users are rented out to customers to solve problems as requested.

How will Itsuki deal with the fate of being president when he's never studied mage-craft!?

Thirteen years ago a disaster occurred. Out of nowhere, a meteorite fell from the sky, and that's when everything started. First of all, there is said to be numerous people who vanished when the meteorite fell. Afterwards, according to certain reports, this was known as "spirited away".

At the same time, strange things happened. The sky filled with clouds, and a red mist shrouded the streets. And those terrible monsters had started to appear. A monster, in other words, a slave beast, one who has sold his soul to the evil king.

However, we must not despair, they have returned from the depths of the red hell, and in order to defeat the impending disaster they carry with them a gift in their hands.

"They have returned, the ones who posses the flash have returned to tear apart the fear."

From Aerandria Scans:
A devil-may-care playboy encounters a girl who will change him and his views on life forever.

Note: the Korean movie is called Now and Forever.

Kanou is in love with one of his employees, the handsome Sawamura, who is really nice and popular. But Kanou is used to having bad luck in love, so he decides to hold back his feelings... But during a drunken night, events take a surprising turn... And Kanou realizes that the Sawamura he imagined, may be very different from reality...

From Chibi Manga:
The day of her graduation, while she was lost and end up on the infirmary, a girl met by coincidence a good looking boy. But she was so panicked that the young man started to make fun of her...?

Sumika, a transfer student, meets 2 handsome boys by chance. And when she enters the classroom.. Sumika is asked to tutor these boys! But one of them confe-... ??
The story unfolds as Sumika picks which one she loves, in a 5 chapters!

[From Mangacity]:

From the mind that brought you I'll comes a story set in a unique world of samurai and man-slayers reminiscent of the Japan of old. One man wanders the land with a deep past, a deep secret, and a "merciful" right hand...

When they were 12 years old, Runa and Ren were very much in love, but Runa’s mother was against it – they were far too young. Ren did the unthinkable, tried to have the two of them commit suicide together rather than be apart. The suicide was a failure but both kids were hospitalized with serious injuries. It didn’t break them apart but eventually Runa’s parents were able to separate them.

Several years pass and Runa has moved on with a new boyfriend named Shou when Ren suddenly shows up attending the same high school, very sexy and still in love with her, and suddenly her life is very complicated…

In a town, there lives a legend of a phantasmic god of death. He protects the townspeople from all evil criminals but not a single soul knows what he looks like. His name is K. A boy searches for him and tries to discovers his identity.

Midori and Takeru are childhood friends, Midori wants to always stay childhood friends with Take. Midori thinks she knows everything about Take, but what she dosent know are his feelings for her...How will these childhood friends end up?

From Shinnen:

It all started with a small, gentle whisper...
The precious necklace that Papa bought for me is gone! While I was searching for it desperately, a boy picks up the necklace! With a whisper of "It'll get stepped on", he departed. I can't get him out of my head...

Collection of the following stories:
Sagashimono
Seeds of Worry
Kesenai Toge*
Sissou Beat
Aoi Kami Hikouki (The Blue Paper Plane)

*Note: Kesenai Toge has a sidestory in Benkyou no Jikan called Green Days.

Tsukasa, Yoji, and Eiji are friends and members of the motorcycle gang called the Paradise Butterflies. Riding the streets of Hiroshima their goal in life is to top all other gangs in their city.

The return of Class 4-2's Sadomi the sadist and friends! Laughter! Tears! Edutainment! All this and more! Let the nostalgia of your school days wash over you like a tidal wave of blood!

Hamaya-kun shoots evil!
A little love and a little horror!

From Strawberrie:
As a child, Joon-young was always teased because his mother owned a bar that served Americans. When he meets Hae-in, a blind girl, they become childhood sweethearts and he vows to always protect her. However, Hae-in and her mom take off one night, leaving Joon-young and his promise behind. Hae-in later meets Gun-woo, the rich son of a CEO. Among these three, a tragic love triangle begins to form...

These two childhood friends might be completely different in looks and personality but they're close and they understand each other better than anyone. That's what they thought, but is there a storm on the horizon?