My Coquettish Junior Attaches Herself to Me / カノジョに浮気されていた俺が、小悪魔な後輩に懐かれています
"My Coquettish Junior Attaches Herself to Me"
This just got to volume 4, I have not seen much of anything online about it.
Unfortunately, don't have an English TL'ed synopsis, but it seems that the main dude was cheated on by his GF, and his little junior comes by his apartment unannounced to tease him but also take care of him? And she wants to get closer to him / shows him a side of her others don't see.
If anyone knows anything more, I'd love to know. That brunette / auburn haired girl on the covers is the main girl / coquettish junior of the title.