Ōmagadoki Dōbutsuen

Oumagadoki Zoo or originally known Ōmagadoki Dōbutsuen (逢魔ヶ刻動物園 Oumagatoki Doubutsuen sometimes shorten as Oumazoo) was a Shōnen manga series written and illustrated by Kōhei Horikoshi. It shows the rabbit Shiina who is originally a human but was cursed by a ghost rabbit. In order to return to human form, he must show that he deeply cares for animals by creating the world's most popular zoo. There are currently 5 manga volumes published.

Zoo Keepers Arc
Duration: Volumes 1, Chapter 1-7

It shows the life of Hana as a zoo keeper in the Oumagadoki Zoo. She faces troubles with the director of the zoo Shiina, a human that has been cursed into a rabbit which his mental age has stopped.

Vs. Aquarium Arc
Duration: Volumes 2-3 Chapter 8-23

It shows the invasion at the Ushimitsudoki Aquarium to get Igarashi back. At the Aquarium they see another person who has been cursed by an ghost animal, the dictator and director of the aquarium Isana. He's the only person that has managed to get his Aquarium at a popular stage, but has not yet completely broken the curse. The others of the Oumagadoki Zoo has find out that Isana use the animals and that they are working for them as his slaves. The battle between the Oumagadoki Zoo and the popular Ushimitsudoki Aquarium has breaks to the maximum and mostly when at the end they know why Isana has been cursed and more of his cold attitude comes true.

Hanauwa Father and Son Arc
Duration: Volumes 3 Chapter 24-25

After that Shiina has defeated the dictator of the Ushimitsudoki Aquarium "Isana", they head back to the Oumagadoki Zoo. They were been looking who's the strongest of the zoo and as conclusion Shiina wins. A day after that they have defeated the Aquarium Mukio Hanauwa and his father Mukanai Hanauwa are visiting the Oumagadoki Zoo.

Vs. Circus Arc
Duration: Volumes 4-5 Chapter 26-37

In the final arc of the series Hana returns to school where she meets Kikuchi that informs her about the existence of a talking bear in the  Yatsudoki Circus. This prompts Hana and Shiina, alongside Shishido, Uwabami and Kisazou,to visit the circus in order of learn about the mysterious bear and make a partnership with the place, but the leader of the circus, Hierou Michinoke, has other plans for the group.