Otome*Domain The Animation  

Here's a possible rephrased version of your text: Minato has lost his only living relative, his grandmother, who was also his family's matriarch. He feels lonely and overwhelmed by the thought of having to take care of himself on his own. However, during his grandmother's funeral, someone named Kazari approaches him and offers him admission into a prestigious school as well as a place to stay. Although initially grateful for this opportunity, Minato soon discovers that Suzu Academy is an all-girls school, and that the "ojou-sama" he will be living with has her own flaws that shatter his expectations of her as a high-class lady.