1960s --- Tokyo. Shin is a boy who lived happily despite being poor, loses his mother who is his only family member, and falls into deep misfortune. Itsuki, a boy who saves Shin also lost his older sister. Those two boys are joined by Tae, a girl who can see youkai and together with Shin's guardian spirit Suu-san and new Youkai such as Nekomata, they take on a mysterious incident in order to retrieve the souls of their precious family! And what is the shocking truth that awaits them...!? An origin story for how Lord Enma became the rule of the Yomakai. (Source: Wikipedia, edited)

OVA bundled with 4th volume of manga.

Three weeks after the incident that left Captain Napolipolita's ship balancing on top of Graviton City, A-Ko and the gang go on summer vacation. While A-Ko ponders losing some weight and B-Ko devises another plan to defeat her redheaded rival to win C-Ko, Napolipolita and Spy-D experience severe homesickness - begging for a way to return to their home planet. Meanwhile, Hikari Daitokuji - B-Ko's father and the CEO of the Daitokuji Financial Group - arms the local military with new mecha to attack Napolipolita's ship and obtain its advanced technology. (Source: ANN)

Kazushi Sudou is a university student who is visited by his two childhood friends, the sisters Ayane and Kotone Shirakawa. When Ayane discovers that Kazushi not only forgot to buy her pudding but is also using her special lotion in the bath, she decides to take revenge and join Kazushi in his bath along with Kotone. Will the perverted Kazushi be able to remain indifferent to them both? [Written by MAL Rewrite]