This OVA is divided into two parts. First one is about Torii Shoutarou following his younger sister on a date. Second one is about Christmas Eve, which Mitsuki, Yuuya and their friends spend at Kanzaki's house.
Bundled with the limited-edition volume 7 of the manga.
(Source: AniDB)+ More
Characters & Voice Actors

Kanzaki, Yuuya
Main
Majima, Junji
Japanese
Kanzaki, Mitsuki
Main
Hashimoto, Chinami
Japanese
Kotobuki, Hiyori
Main
Ogura, Yui
Japanese
Torii, Moa
Main
Terakawa, Aimi
Japanese
Torii, Shoutarou
Main
Takumi, Yasuaki
Japanese
Akesaka, Nanami
Supporting
Sakuma, Kumi
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