A prelude to Marmalade Boy the TV series. Yuu remembers the day when his parents decided to divorce each other and remarry with another married couple. Troubled by the news, Yuu decides to take a walk, on which he spots a girl he falls in love with at first sight. He decides to follow this unaware girl and falls more in love with her. However he discovers who the girl really is...she's the daughter of his parents' new lovers. (Source: ANN)

When Miki Koishikawa welcomes her parents home from their trip to Hawaii, the last thing she expects is for them to gleefully announce that they are getting a divorce. To her shock, they plan to switch partners with another couple they met on vacation. Barely able to keep her emotions in check, Miki begrudgingly attends dinner to meet the other couple and their strikingly handsome son, Yuu Matsuura. After moving into a spacious house with her newly blended family, Miki struggles to adjust to her new lifestyle and her blooming feelings for Yuu. She attempts to navigate the coming school year with the help of her best friend, Meiko Akizuki, who is hiding a scandalous relationship of her own. However, the road ahead is not simple, as both Miki and Yuu have other potential suitors and emotional baggage from their pasts they are reluctant to reveal.

Mars is now almost entirely covered in water. Humanity exists in large city-ships that float through the open seas. But life is hard for those who live on Mars—the economy is in bad shape, work is scarce, and food is expensive and highly prized. Gram and his friends try to do the best they can, but the work keeps drying up. Some have taken to a life of piracy to combat the corruption in the government; one such group is the pirates of the feared Ship of Aurora. And the Earth government, which rules Mars, has dispatched a new team of military pilots to combat them. In their specialized mecha called Round Bucklers, they must make the seas of Mars safe for humanity. Caught in the wrong place at the wrong time, Gram finds himself on the run with the most notorious pirates on Mars. But here's the thing—he's starting to like them! (Source: Bandai Entertainment)

Hida Kizuna possesses the HHG (Heart Hybrid Gear) ability, but it is not strong enough to make him particularly important. His older sister calls him to transfer to a strategic defense school, where many of the students (many of which are large-breasted girls) use their HHG abilities to fight invaders from another world while wearing extremely skimpy pilot outfits. Kizuna's fighting ability doesn't measure up, but his sister has another plan—apparently having erotic experiences with Kizuna will allow the girls to replenish their energy or power-up. It looks like his new school life is going to be full of embarrassment. (Source: MangaHelpers)