Yes, I’m looking for this manga as well.
If I’m not mistaken its about a very poor and homeless student girl get picked up/saved by this guy. Her environment has been very poor to the point that make her feels very not worthy to sit at the guy sofa or something?

If he meets her in the rain, it might be: Class no Bocchi Gal o Omochikaeri shite Seisokei Bijin ni shiteyatta Hanashi

Now I remember, theres also something like that in Fruits Basket

Yojouhan no Ibara Hime

wine baths?