Two years have passed since the EL-Divers incident, and the popularity of the game Gunpla Battle Nexus Online (GBN) has continued to skyrocket. With the addition of exciting new features such as missions and story events, the GBN experience is more immersive than ever before. Amidst the player base, a user known as Hiroto Kuga has been gaining notoriety for his top-notch skills. Through a series of coincidences, Hiroto meets three other players: the boastful Kazami Torimachi, the mysterious May, and the timid Parviz. Forming the "BUILD DiVERS," the unlikely group sets on a story mission rumored to carry bountiful in-game rewards. Together, the BUILD DiVERS must confront their own weaknesses as they join arms in a journey that may very well transcend the existence of GBN itself. [Written by MAL Rewrite]

When Saga—now 15 years old—arrives at her home after a day of errands, her grandmother Regina discovers an old dress in the attic. At this point, Saga recalls the time her elementary class participated in a play titled "Princess and Fairy." She volunteered to play the role of the Princess while her rival Greta played the evil witch. The production of the school play reminded Sugar and the other fairies of the time "The Bear Pianist" played in the town not too long ago.

The war between the Terrans and the Vers Empire of Mars has ended, allowing humanity to blissfully enjoy their lives in a time of peace. Nineteen months later, however, the Vers princess makes a shocking public declaration: "the Terrans are a foolish race that covets resources, destroys nature, and are devoted to the pursuit of pleasure." And so, to protect their precious Earth, she calls upon her knights to take up arms, and the raging battle between the two civilizations reignites. Slaine Troyard has found a place among the Martians, giving Earth a short respite from the war against the Vers Empire. However, a peaceful resolution seems inconceivable. The various people who fought desperately for survival in the past now find themselves in the midst of yet another bloody and chaotic conflict, one that will forever alter the fate of humankind.

Second season of A Day Before Us.