Boy/man school complicated love adult

Suzuhara Jan is a new college student determined to devote himself to his studies. But a chance meeting with handsome professor Aoyama and discovery of the "Game to Win the Professor's Heart" become a distraction. Though he can't seem to stay away from Ao

Yuzuru ran away from Daisuke after high school but bumped into him again years later at his company. Was it fate or is everything going according to Daisuke's plan. Can Yuzuru really win against the married Daisuke?

High school art teacher Jun Usami has loved his best friend, Ryuuta, since they were high school students. Unbeknownst to Jun, Ryuuta's younger brother, Takumi Kajiwara, has been in love with Jun since he caught Jun stealing a kiss from his sleeping brother. As fate has it, Takumi has grown into the exact image of Ryuuta. Now that Takumi is a high-schooler and Jun's student, it's the perfect chance for Takumi to get close to his 'Usa-nii'.
The wheels of fate begin to move in Takumi's favor when

University student Toshiaki Kaji is in the middle of a delayed phase of rebellion towards the world. Determined to live an exciting and eventful adult life, he is intent on defying all the rules. And after meeting a strange group of people at the school cafeteria, his life is anything but boring. In fact, it is becoming gayer!

Kenmoto Kazuki is a 15 year old high school student who is late for school on his very first day. As he's running to school he sees someone ontop of a wall that warns him not to go through the main entrance. Without a second thought he blurted out three words, "Please marry me!" From the shock the person falls off the wall where Kenmoto Kazuki discovers he just proposed to a man. This man was not just any man, but Morikeoke Akitou his homeroom teacher!

Rules series timeline:
1) Please (ch5)
-- Hydra dj - Kiss
-- Hydra dj - Kiss After
2) Hydra dj - Skies
3) Hydra 1+2+3+4 (ch1-4)
4) Hydra 3+4+5+6 (ch5-6)
-- Hydra dj - Blue Film First (after Hydra ch8)
-- Hydra dj - Heavenly (between Hydra ch9 and ch10-11)
-- Hydra dj - The Days Before
-- Rules dj - Real Thing
-- Rules dj - Hello Again
5) Lovers and Souls
6) Rules dj - Fragile
7) Vanity **
8) Dreamers High **
13) Rules (volumes 1 & 2)
14) Rules dj - If Winter Comes, Can Spring Be Far Behind?
15)

Kuroe is annoyed by his always-smiling teacher, Mizushiro. "So you treat all your students equally? So annoying!" Kuroe passes his boiling point and decides to take action in this ardent and thrilling school romance.

Published in collection "Only One" together with:
1. Only You
2. Only One
3. Yasashisa no Kyori (The Gentle Distance)
4. Mousou Prize! (The Delusionary Prize!)
5. 17-sai no Paradox (A 17-Year-Old Paradox)

From Beyond the Sky:
The affectionate top student Hamada, and the simple, but cool Osamu are both deeply attracted to each other. Hamada, being the affectionate one, is easily attracted to other people, regardless of their sex. However, in the end, he wi

Shuuji is a new teacher, but most of his worries don't stem from the stress at being in a new situation, but from the nightly visits of his lover Yuu -- a student at the same school. And Yuu has ... issues.