After getting stranded on Earth, Sonic and his friends team up with 12-year-old Chris Thorndyke to collect all the Chaos Emeralds and defeat the evil Dr. Eggman.

An OVA released after the end of the The Disappearance of Nagato Yuki-chan. It was released as a bonus with the limited edition volume 9 of the manga.

It is mid-december, and SOS Brigade chief Haruhi Suzumiya announces that the Brigade is going to hold a Christmas party in their clubroom, with Japanese hotpot for dinner. The brigade…