Futari Awasete Puramai Zero

Yamada Nadeshiko has always had a negative personality, so she always thinks that whatever she does, it will lead to the worst possible outcome. But by meeting Samejima-kun, with his conceptualization, she finds that she can slowly become more positive.
Then Nadeshiko realises that she has fallen for Samejima. What is she supposed to do now!?

(Source: Intercross)