Kikuchi Ima's first love was her sister's boyfriend, who is 11 years her senior. Nine years later, she meets him again ... and this time, he is her homeroom teacher. What will become of this one-sided love?

From Esthetique:

Non-chan has never been able to catch up to top stylist and childhood friend Omi. Following in her father's footsteps, Non trains hard at the Jisen Sougou Beauty School. Clumsy and headstrong, will Non-chan be able to triumph as a hair stylist and find love along the way?

From Aerandria Scans
Due to some unusual circumstances, Yutaka, a popular university student, often called a miser (!?), raised by his strong sister, is an acquaintance of Rika, the owner of a host club. And then he meets Ritsu, the number 1 host at that club, and Kirishima, a lawyer who's also a customer who adores Ritsu...!?

Motsumoto Ichi, who studied earnestly to be admitted to the same high-school where his first love Tomo-chan attends, came to “Rise Apartment” to meet her after 11 years but...? Showered with the affection of Ryou*heart* School life & Living together!! It also includes an unpublished work about dance and romance “Diamond”!!

From Viz:
Sachie Wakamura just lost her mother, and her estranged grandfather has shown up to take care of her. The only problem is that Grandpa is the head of a yakuza gang! Sachie tries to continue living her normal life, but she can't run far since Rakuto, one of the most popular guys in school, is part of her grandfather's gang and her new protector. Soon, Sachie finds herself falling for her bodyguard. But she's the granddaughter of Rakuto's boss, so she can never show her feelings for him. Can Sachie find a way to fit into her new family and seize her chance at romance?

She dreams what any normal woman dreams: Find a good man and get married. There's only one hitch. She has absolutely zero talent in being a housewife! Determined to overcome this problem, she enrolls in classes to learn. The only problem is her teacher turns out to be a man and a younger one at that!

(Source: Aerandria)

Tetsuta's mother died when he was a small child, and after that his father always came home late from work. It had always been Tetsuta's wish that his dad would come home early. Then one day his dad anounced that they would be having a new babysitter to take care of them! Tetsuta was strongly against this until he met this beautiful babysitter... (Source: mangaupdates)

Kousaka Shin's ultimate dream is to become a doctor. So despite the facts that she is a cry baby, a coward, has a baby face, and only has an A cup--she is much more passionate about persuing her goals than others. One day her teacher, Abe-sensei, tells her she is not fit to be a doctor. From then on, a battle between them begins. There's an added twist! Abe-sensei and Shin are neighbors! Now, her journey to becoming a doctor will be even more difficult than imagined!