Kanojo ga Kare ni Ochiru Riyuu

From Intercross:

1) Kare ga Kanojo ni Ochiru Riyuu
After school, being hit upon by a younger, obnoxious man.
...But, somehow, when alone with him, I easily become nervous.
What if, such a kouhai suddenly kisses--?
"It's frustrating to find myself falling in love with you"
"That's just useless struggling"

2) Amekakure no Kaerimichi
Tachibana Mitsu loves umbrellas and the rain. Whereas, Sugisaki is popular, loves sports and summer. They couldn't be any more different, their similarity only lies to sitting in class next to each other, however, they may have one thing that they have on common...

3) Satou to Bitter Chocolate
Hana just gave chocolates to the boy she likes Takuto. Little does she know that he is soon to be her brother! What will Hana do? Will she still continue loving him?

4) Seinaru Yoruni Oshiete Ageru