"I'm searching for a manga and I'm hoping someone can help me identify it. A key detail I remember is how the author portrayed the male lead's change in personality after he starts dating the female lead. He was reserved before, but became very affectionate afterward. Crucially, there was a panel showing this transformation side-by-side: him being indifferent to her before, and then acting like an excited, puppy-like boyfriend after. Does anyone know which manga this could be?"
My guesse(s) are: kiss sixth sense but couldn't find the pic.