If you're looking for manga similar to Yoi Kono Tanoshii Christmas, you might like these titles.
Kokoro found a strange machine in her basement, as well as a variety of problems to solve!
Kaji and Yuki have been dating for one month. On their first Christmas Eve together, Kaji thinks there will never be a better chance to lose their virginities, but Yuki is worried…
Wreath, a Junior Santa, fails in his task and has to leave the North Pole. His helper, Mr. Reindeer, has always wanted him. He had been willing to wait but now he's out of time so, before Wreath leaves, he seduces him.