The protagonist, Mutou Shoutarou lives on a dorm run by the Kamishiro family, and they get along pretty well everyday.
But one day, his childhood friend Makimura Minori came to his place.
"Shou-chan, I'm gonna be your Christmas Present!"
Then in a month early of Shoutarou's christmas present, started the girls' competition to get Shoutarou.

The manager in his residing dorm, Kamishiro Tamami who had a huge crush in him, and her 2 daughters,
Kotori and Hina also decided to join the competition. And finally, Yukine, Minori's litle sister who hated
Shoutarou to death followed her sister to force her to return home.
How can Shoutarou face this circumstances? -- Love Comedy with Donburi Outbreak

[Translated from Getchu]