Heartthrob is going to save the world?! <br>From a life-size high school girl, a new girl of the century has finally appeared. <br><br>Mitsushima Hikaru (15) is a run-of-the-mill freshman who holds an unrequited love towards her senpai (a sophomore) from the astronomy club. But one day, after she makes a wish upon a falling star, she becomes fused with the star (alien) for some reason. Hence, she obtains the strange ability to grow into a giant. <br>That is when Hikaru's life goes for a complete change, as she begins to do battle as a giant heroine?!

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