ブラインドプリズム ~Rainy Season~

Kuronagi Mikoto, a student in her first year of high school, is irritated.

This is because her older brother of two years, Kuronagi Wakazumi, is becoming increasingly overprotective and meddlesome.

As the president of the Japanese Archery Club with both an attractive face and figure, he is very popular with the female students. She wonders why he is so strict with her, even though he has a kind attitude towards other girls.

One rainy day, Mikoto relays her concerns to the school nurse, Nikaidou Shinobu. Nikaidou sneaks his way into the holes of Mikoto's heart like a gentle, quiet rain shower...

From then on, the the relationship between Mikoto and Wakazumi gradually begins to change.

It's the rainy season. Hidden feelings begin to pour down without pause...

plot summary.