If you're looking for anime similar to Manga Doushite Monogatari OVA, you might like these titles.
The second half of the special will look back at the Pokémon XY & Z series so far and provide a complete explanation of "all the mysteries" in the show, including: the secret that Zygarde hides, the goal of Alain and Team Flare, and the strange phenomenon that only seems to happen to Ash and his Greninja. The second half will also preview what will happen in the future of the series, including Ash vs. Alain, Team Rocket vs. Team Flare, and Serena taking on the Pokémon Showcase
Some time ago, the evil Poseidon destroyed the continent of Atlantis and all of its inhabitants - except for two: the green-haired baby Triton, and the mermaid Pipi. Triton was brought by the white dolphin Ruka to the shore of a fishermen's village; and there, he was raised by a kind man for thirteen years. However, the time has come for Triton to learn the truth about his heritage, the death of his parents at the hands of Poseidon, and what he must do henceforth: track down Poseidon and bring peace to the seas again. With the help of Ruka, Pipi and other aquatic friends, Triton sets forth to fulfill his destiny.
Yamato and Momonosuke look back on Oden's adventures and heroic actions throughout the world and in the Land of Wano. Yamato describes for Momonosuke all the joy and pain that his father went through during his days.