Secret Kiss

From Manga Abyss:

Wakaba attends the cram school where the popular Toudou-sensei works. The quiet but easily angered Wakaba is a weak person… and she suddenly confesses! Even though Wakaba thought she wasn’t being taken seriously, sensei came to console the broken-hearted Wakaba. They decide on a ‘trial date’ to see if they’re compatible, but sensei is an adult and also popular, and Wakaba is uneasy…

Contains two extra stories:

Aoi Bokura
Yayoi and Junya are a couple. She was dumped by her ex-boyfriend for whining and being too clingy. So this time she restrained her feelings towards Junya, including her jealousy of other girls.

Love You
Arisugawa Koto, the student president of an all girls high school, meets with the boys' student president to plan a mixer between the two schools. She remembers Taichi from her childhood when she confessed to him, but he calls her "ugly."