Kimi to no Haru wa Kaguwashiki

The protagonist, Yuzu Kadokura, has a highly sensitive sense of smell, making her dependent on wearing a mask.

One day, after feeling sick due to a strong smell, she is rescued at the train station by a younger male student, Kairi Takamiya. Since she thanked him for his help, he has started talking to her, seemingly for no reason.

But there is a certain reason why he keeps approaching her—?