Manga I Ended up Giving the Key to My Home After Spoiling the Kuudere Next to Me

Natsuomi Katagiri, a high school student who lived alone for two years, discovers a mysterious and alluring girl with midnight-black hair and cerulean eyes in the apartment next door. Yui's background is that of a noblewoman from a far-off land, and her nickname around school is "Coup de Lera" due to her carefree nature. Natsuomi knows Yui would rather not rely on anyone, but he sees her as naive and inexperienced. Thus, Natsuomi decides to offer her assistance.

“What’s on the menu for tonight… Fried chicken, you say?”
“That’s right, since it’s on sale today.”
“Fried chicken’s my favorite. I’m really looking forward to it.”