From Nakama:

Kawakami is a top student with a penchant for donuts. Kaji is a troublemaker who fell deeply in love with Kawakami. Although they ignore each other at school, when they're all alone... they eat, kiss and... play. “You're so annoying!” is Kawakami's favorite line, but there's much more than meets the eye. A cute story of an unusual first love!

"Wh-Who are you?"
One day, the college student Taichi is spoken to by a stranger in a place that is very dear to him. He is informed by the man, who calls himself Zama, that the place may be gone. It is where the orphaned Taichi first met his beloved guardian Kanda.
Who is this Zama, who suddenly appears before Taichi? Taichi is anxious...
(Source: Baka-Updates)

The feeling of love is difficult. That’s why I’ll try to be together with you. A teacher? A student? Their feelings?

Fumichi is a male waiter at a bar. He often gets harassed by the customers that demand special service from him. One night, he gets beat up by a customer that got offended, and was taken in by Sazawa and his daughter, Iyo. Join them in their interesting relationship.
(Source: Girls' Generation)