OVAs of Seitokai Yakuindomo* which were either bundled with the limited editions of the manga volumes or as standalone OVAs.

On the day of the Tanabata festival, Shidou Itsuka happens to meet the eerie Kurumi Tokisaki, who proceeds to ask him out on a date. Although nervous, Shidou accepts the offer. The two spend their time visiting to a planetarium, buying food at the festival, and trying out a mock wedding ceremony. Meanwhile, Shirou's friends—Tooka Yatogami, Yoshino, and Kotori Itsuka—are looking for him, while also enjoying the festival themselves. As Shidou spends the day with Kurumi, he begins to notice an unexpected softer side of her. He knows that Kurumi is infamously called the "Worst Spirit," but the girl standing before him is a gentle soul. However, as the day draws to a close, Shirou finally begins to understand the truth behind it all. [Written by MAL Rewrite]

OVAs of History's Strongest Disciple Kenichi bundled with volumes 46, 47, 49, 53, 54, 55, & 56 of the manga.

Hiyori Iki goes on a skiing trip with her parents and happens to bump into Yato and Yukine. After a short while, they find the other gods who are there for a company vacation. But amidst all the fun, someone is plotting a heinous crime, and Yato is the primary target. On a different day, Yato’s been able to make a small fortune from his last job and decides to take Hiyori and Yukine to Capyper Land. Although she agrees without knowing the destination, will Hiyori actually enjoy the day considering what happened on her last visit? [Written by MAL Rewrite]