The young girl Clara visits her Aunt Gerda and Uncle Drosselmeyer. Her aunt tells her scary stories about the Ragman, a creepy and mysterious man who turns children into mice if they don't go to bed on time. The Ragman is always spying on sleeping children searching for more victims. Just before Clara goes to bed her eccentric uncle gives her a wooden nutcracker doll. He's a bit embarrassed because the only part on the doll that's perfect is the heart, but Clara loves her new doll. She falls asleep but wakes up hearing mice squeaking...

Kyoutarou Ichikawa may look like a shy and reserved middle school student, but deep within his heart is a bloodthirsty killer. His ultimate desire is to see his classmate Anna Yamada's beautiful face writhing in pain before he ends her life. But this fantasy may never come to fruition, as Ichikawa starts to see an entirely different side to Yamada. Often seeking refuge in the library, Ichikawa frequently runs into Yamada. It is during these encounters that Ichikawa realizes his model classmate is actually an airhead who can never read the room. As they spend more time together, the boy cannot help but feel not only a sense of endearment toward the very girl he wishes to murder but also a desire to protect her at all costs. Is it possible that this sudden change in Ichikawa's perspective could lead to something more?

Mai, a Santa in training, appears in front of an unlucky boy named Santa on Christmas Eve, promising him that she will make him happy for one night.

Bundled with the 11th, 12th, 13th and 24th volumes of the Yuragi-sou no Yuuna-san manga. The first episode will adapt the manga's 12th chapter. The last OVA will adapt the 99th chapter of the manga, "Noroware no Kogarashi," and the 141st chapter, "Giri Giri!? Onsen Happening."