High school student Haru Yoshioka is bored with the monotony of life. One day, she saves Prince Lune of the Cat Kingdom from being run over by a truck. As a token of gratitude, the Cat King sends her "presents" and invites her to the Cat Kingdom to become Lune's wife. Haru's inability to properly communicate with the cats leads to the misunderstanding that she has accepted the proposal.

As Haru ponders on ways to escape the predicament, a mysterious voice instructs her to search for the Cat Bureau. However, not long after she finally arrives at the bureau, a horde of cats swarms in and forcibly takes her to the Cat Kingdom, along with a member of the Cat Bureau. Concerned for their safety, owner of the Cat Bureau, Baron Humbert von Gikkingen, follows close behind.

The more Haru immerses herself in the activities of the Cat Kingdom, the more cat-like she becomes. To her dismay, she soon learns that, unless she can find her true self, she may become a cat permanently. Haru's adventures in the world of cats lead her down a path to self-discovery, allowing her to return as a more confident person.

Suffering from frequent asthma attacks, young Anna Sasaki is quiet, unsociable, and isolated from her peers, causing her foster parent endless worry. Upon recommendation by the doctor, Anna is sent to the countryside, in hope that the cleaner air and more relaxing lifestyle will improve her health and help clear her mind. Engaging in her passion for sketching, Anna spends her summer days living with her aunt and uncle in a small town near the sea.

One day while wandering outside, Anna discovers an abandoned mansion known as the Marsh House. However, she soon finds that the residence isn't as vacant as it appears to be, running into a mysterious girl named Marnie. Marnie's bubbly demeanor slowly begins to draw Anna out of her shell as she returns night after night to meet with her new friend. But it seems there is more to the strange girl than meets the eye—as her time in the town nears its end, Anna begins to discover the truth behind the walls of the Marsh House.

Omoide no Marnie tells the touching story of a young girl's journey through self-discovery and friendship, and the summer that she will remember for the rest of her life.

Mirai, an improved Kongou-class Aegis guided missile destroyer, is one of the newest and most advanced ships in the entire Japanese Self Defense Force (SDF). Her crew, also one of the newest, is lead by Capt. Umezu Saburo and Executive Officer Kadomatsu Yosuke. While running scheduled training exercises one day, Mirai encounters a fierce storm that throws their navigation systems into temporary disarray. After a few minutes of recovery, the crew is shocked to discover that they've been transported back in time to June 4, 1942—The Battle of Midway, during World War II. Letting history take its course for this battle, they manage to avoid the conflict firsthand and make a vow to remain anonymous, changing history as little as possible. However, when the crew comes across the dying Lt. Commander Kusaka Takumi, XO. Kadomatsu's instincts to save lives takes over, changing the course of history more than he could've imagined.

Kouichi Sanada and Kazuki Aihara's childhood friend Mao Mizusawa has returned after living in France for a couple of years. Kouichi is surprised to learn that, since her parents are remaining overseas for the time being, his mother has agreed to let Mao stay with them. The three friends help each other deal with the ups and downs of high school romance.