Based on the manga by Mikan R.Makoto has been best friends with the beautiful Une since they were kids. Every school morning, he rides his bike over to her place, picks her up, and takes her to the train station where they catch the train to high school. He's very much in love with her, but doesn't do anything until he discovers another guy in his class is about to make a move on her. Is it to late to tell her how he feels? Will fellow female classmate Nonoka confess her love to Makoto?

In the late 21st century, humankind came under a fierce attack from aliens who suddenly appeared via wormholes. They were helpless to fight against them and resigned themselves to imminent death. At that time, an ultimate weapon which could create items out of imagination was discovered in a expansive cave under Japan, along with its young master Ryuusei who was in cryostasis. The indiscriminate alien attacks awoke him and he led the humans to a decisive victory.One year later, while the areas which had been destroyed by the aliens were still being rebuilt, Ryuusei was appointed as the commander of the newly-formed Defence Force of Earth, which was created to fight against space invaders. However, he was the only person who could use the ‘imagination embodiment device’. If something was to happen to him, then calamity would befall the world. So the Defence Force of Earth decided to recruit girls with potential to fight alongside him. Even though they hesitated at first, they each had their own reasons to join Ryuusei. Thus, the special force ‘Blade Briders’ was formed, to protect the Earth against the aliens who have returned.

Aki Aoi and Sora Aoi are a pair of close siblings who have shared an intimate bond since childhood. During their coming of age, they each come to realize the true depth of the love they feel for each other and consummate that love in secret. They keep their younger sister, Nami, Sora’s twin, in the dark about their new relationship. Nami, clueless of what is happening in her household, aims to set her brother up with her best friend, Kana Sumiya. Despite these relationships Nami seems to have feelings for someone near to her too, but keeps them secret.