Cool na Megami-sama to Issho ni Sundara, Amayakashi Sugite Ponkotsu ni shiteshimatta Ken ni Tsuite

One day, Haruto Akihara, a high schooler who lives alone, finds that his stunningly beautiful classmate, Rei Mikoto, is now living with him! The so-called "Icy Goddess" acts coldly towards him at first, but Haruto's devotion slowly turns her into a shamelessly affectionate, hopelessly clumsy girl!

(Source: Square Enix)