From Fujoshi Bitches:

Ichigaya and Tomoki are high school students, they don’t really know each other. One day Tomoki falls asleep during class and wakes up to find that the “cool” Ichigaya has painted his nails with a classmates polish. The only way to get it off it to go to the home of Ichigaya. There Tomoki steps into the lonely life of Ichigaya.

A one-shot side story of Tokumaru Madoka and Hasune Kazuma, the main couple of Koi Cha no Osahou.

A comedy in a love hotel room.

Chapter 1-3, 6: Hidaka Atsushi and Sakaki Youichi have known each other since senior high school, and are now going to the same college together. They share a "rotten relationship", according to Atsushi, who, at one time, gave in to temptation and slept with his friend. Disgruntled about having to play the "bottom" role (since Youichi is 20cm taller than him), Atushi seeks out a smaller, cute boy to whom he can play seme to. Chapter 4: The Melting Point Chapter 5: Smiling At Tomorrow's Sky

From BLU:
Get ready for hot tea and hotter action in this tale of opposites attracting on the tatami mats. Poor Tokumaru Madoka is just a regular energetic guy that can't seem to go even five minutes without breaking something. One day his hapless sister has had enough, and she forces him to join their high school’s Tea Ceremony Club, hoping to instill a little discipline in her hopeless klutz of a brother. Tea Ceremony Club president Hasune Kazuma is Tokumaru’s complete opposite. The tall, dark president is the pinnacle of restraint, having been taught from a young age how to uphold his family’s traditions. The sophisticated president and his awkward pupil conceal a brewing attraction, but they can’t avoid steaming each other up. But even full to the brim with passion, will the two of them be able to bridge their differences and get along with each other?

1) The Memory of Water
Shiina is an ex-swimmer who is now a chain-smoking high school teacher. He's tried to leave his swimming past behind him, but upright student Kadokura won't let that happen.

2) Forecast of Life's Springtime
Minori is the son of professional gardeners and he's sick to death of flowers! Gardening club student Shoutarou kills everything he touches, and Minori feels sorry for him.

3) A Child's Belongings
Hiroto's parents died in an accident and then he is approached by a businessman who wants to buy him. But he's not interested in sex, he just likes to look at Hiroto in his school uniform.

4) Sweet Home, Bitter Brother
Atsuhiro and Yousuke were childhood friends who became brothers at a young age. They've always been together with the slightly older Atsuhiro leading Yousuke. But Yousuke has feeling's he can't tell his "brother" and resolves to go away to college.

5) Paradise Game
Hazuki Junya is a professional gamer who works for a video game company, but when he gets beaten by his new coworker and amatuer Hatanaki Ryouji he can't believe it. A friendly rivalry and friendship starts between the two.

[From Biblo Eros]:

High school love has many obstacles... in this case mostly amusing.

1-4) By Your Side
As far as Yuzu remembers, since his childhood, Icchan would always come to his rescue just like a Prince in shiny armour. But Yuzu has grown taller than Icchan! A huge Princess and ultra popular handsome Prince?! A story about schoolboys, will their love bloom?

5+extra) March for Victory

High-school student Ao decides he’s in love with Ryoumei-san, a priest at the local shrine and Ao’s childhood friend. Not one to beat around the bush, Ao immediately tells Ryoumei he wants to do perverted things together, but it will take more than a little persuading to get the shocked Ryoumei into bed. Between bad advice, romantic rivals, and Ryoumei’s scruples, there are many obstacles in the path of true love.

Note: Shunpei from Koi Cha no Osahou appears in this story as the main character's best friend.

The sweets shop owner Tanihara goes to for love advice with a stern, scary looking pediatrician. Though the doctor has one serious looking face but deep within he's a gentle soul. Not to mention he isn't afraid of showing his love or the fact that he's gay.

The game of "trick-or-love" between the happy-go-lucky father and the scary but popular pediatrician! Normally the paths of a shrewd man and a stoic man would never cross...

1-4, 6) Calorie - Heat
Toshiyuki has loved his best (and heterosexual) friend Yasuhira for 15 long years, but decides to give up his fruitless love. Then Jun, who is their mutual friend and knows about Toshiyuki's unrequited love, comes forward as a candidate lover. Toshiyuki is glad despite knowing that Jun has always comforted his broken heart whenever Yasuhira got hiself a new girlfriend. Yet, he decides to take his first chance in love....

5) Eyes That Don't Lie
Shou's boyfriend, Chizuru, likes to see his expression when he is not happy and always does things that he hates. Even though Shou wants to have a normal relationship, he endures his weird fetish because he does not want Chizuru to lose interest in him. However, what happens when Shou shows him an expression when he is not mad?