Wasuremono

From Attractive Fascinante:

1-2) A Return Flower
Masatsugu, a calligraphy sensei, liked his student, Sumiya, for a very long time. His feelings got stronger and he started to avoid eye contact with Sumiya. Sumiya sensed Masatsugu’s awkwardness and confronted him. They eventually did it and Sumiya didn’t look for Masatsugu anymore after that. Then one day, Masatsugu came home to find Sumiya at his doorstep…

3) Next Door
Hayato just moved from his hometown to the big city for university. Unsure in a new place, he finds comfort from his neighbor Arisue Takashi. Hayato very quickly realizes that what he feels for Arisue-san is more than friendship... it's love. Quietly ignoring his feelings, Hayato tries to help Arisue-san as much as possible - until one day a woman answers Arisue-san's door. Hayato excuses himself as fast as possible... will Takashi run after him, or will Hayato's love be forever unrequited?

4) Let's try it
Senpai-kouhai love!

5) Lost Article
The selfishness of each partner, and the sacrifices and compromises each side must do to make a relationship work out.

Extra) Have you got everything?