Zense de Kazoku ni Megumarenakatta Ore, Konse dewa Yasashii Kazoku ni Kakomareru

The protagonist, who was raised as an orphan and died without ever knowing the love of a family, is reincarnated as Ares—the beloved second son of a noble family!? His parents adore him, and his older sister and brother are always by his side. Growing up in a household overflowing with love, Ares's life is a complete 180° from his previous existence.

Then, on an otherwise peaceful day, Ares is discovered to have the ability to use "Ice Magic," which is supposed to be impossible in this world!? Before long, his fate begins to shift dramatically, involving even the entire kingdom!

(Source: AlphaPolis, translated)