Jimoto ni Kaettekitara Osananajimi ga Kowareteta

"This is what I've become."
"I've turned into this."
"He is still the same."

Touma returns to his hometown and happens to run into his childhood friend Kyouko. However, she was supposed to be a tomboyish and cheerful girl, but now she is like a completely different person. Despite her flashy appearance, Kyouko's feeble voice and actions stand out, and as she interacts with him several times, the distance between them gradually shrinks...

(Source: Kadokawa, translated)