With great advancements in technology, mankind has created hIEs, human-like robots that act as public and personal servants for society. Unlike many others, the kind-hearted high school student Arato Endou treats hIEs as equals, but his financial situation keeps him from ever owning one. However, his normal life is shattered when an ordinary run to the local grocery store goes horribly awry. Viciously assaulted by a hacked hIE, Arato is on the verge of death; but luckily, he is saved by an abnormal hIE carrying a weaponized coffin. Her name is Lacia, one of five highly advanced hIEs that recently escaped the clutches of the mysterious MemeFrame Corporation. Faced with a hacked car threatening to run them over, Lacia offers Arato a deal: in exchange for saving his life, he must register as her new owner, thus taking full responsibility for her actions. With little choice, he decides to trust this artificial girl and allows her to live in his home. Though Lacia begins to adapt to her new, peaceful lifestyle, she warns the entranced Arato of one thing—she does not have a soul. [Written by MAL Rewrite]

This is simply the OAV summing up the major events and battles of "Initial D 4th Stage" much like the "Initial D Battle Stage" original summed up the first 3 seasons. Additionally, has 2 extra battles from the manga that were not incorporated into the original 4th Stage. (Source: ANN)

The Sailor Guardians and their leader, Sailor Moon, continue their duty of protecting Earth from any who would dare cause it harm. However, Sailor Mars' apocalyptic visions and the appearance of two new guardians—Sailor Neptune and Sailor Uranus—signal that a new battle will soon begin. These newcomers seek three Talismans that are inside the Pure Heart Crystals within human beings. Once brought together, these objects form The Holy Grail, a magical relic with extraordinary abilities. They want to use the Grail to save the world, but an evil organization known as the Death Busters seeks its power for their own desires. The removal of a Talisman from a person's Heart Crystal will cause their death, something that Uranus and Neptune see as a necessary sacrifice to form the Grail, while Sailor Moon and her group deem it unforgivable. But can any sacrifice be worth the cost if it saves the lives of the entire human race? [Written by MAL Rewrite]

Iketani missed an opportunity to see Mako-chan and hates himself for never calling to say he was sorry. By chance he runs into her 6 months later, and the situation is awkward. Iketani does not have time to talk at that moment, but both want to talk, so they arrange a second meeting. Iketani goes to the meeting place early, but an old man was left behind from an tourist bus, and asks Iketani to catch the bus for him. Iketani being a nice guy, so he can't say no.