Two OVA episodes featuring additional stories. Episode 0: Ritsu and Takano used to date back in high school, but broke up due to a misunderstanding. This is that story. Episode 12.5: Hatori and Chiaki go to visit the latter's family. It's really awkward in many, many ways.
Up to EP 12Amanchu!Anime
Up to EP 1Initial D: Project D to the Next Stage - Project D e MuketeAnime
Up to EP 12Boarding School JulietAnime
Up to EP 1Fate/stay night Movie: Unlimited Blade WorksAnime
Up to EP 25Major S6Anime
Up to EP 25Baby StepsAnime
Up to EP 12Gakuen Basara: Samurai High SchoolAnime
Up to EP 51Ace of Diamond: Second SeasonAnime
Up to EP 26His and Her CircumstancesAnime
Up to EP 12Damepri Anime CaravanAnime
Up to EP 1K: Seven Stories - The Idol KAnime
Up to EP 12Hey, Your Cat Ears Are Showing!Anime