I Ayaka Oishi, born on August 12, 1983, is a Japanese singer, songwriter, and musician. She rose to fame in the early 2000s as the lead vocalist of the Japanese pop-rock band, I. The group gained a significant following, particularly among the younger generation, with their catchy melodies and Oishi's distinctive vocals.
Based on your request, it seems you're likely referring to the popular manga series ( Ayaka-chan wa Hiroko-senpai ni Koishiteru i ayaka oishi perfect g hiroko