Having witnessed the 1/1 scale RX-78-2 Gundam in Odaiba, Haru Irei experiences an overwhelming sense of inspiration to build his own Gundam plastic model kit, known as Gunpla. Setting his sights on the exclusive GPB-X80 Beginning Gundam, Haru completes the construction of his Gunpla, officially becoming a Gunpla Builder. Entering the virtual realm of Gunpla Battle, Haru engages in various team matches and one-on-one duels, utilizing his customized Beginning Gundam. To achieve the rank of Gunpla Meister and emerge victorious as a Gunpla Battle Champion, Haru must rely on the support of his friends.