Nikola is just a village girl working at the inn...until the day dragons invade, and she meets Haga, a scholar of everything around him. He's a part of an elite society called Seeker, created to address a series of maladies plaguing their usually peaceful world. But both Nikola and Haga have secrets they hide...ones that will change each other's very existence... (Source: Kodansha USA)

Duke Fleed is a survivor of the Fleed Planet who has escaped to Earth. Onboard a mysterious spaceship, he is raised by Dr. Umon as his adoptive son, and becomes known as Daisuke Umon. Years after his arrival, he's faced with the threat of King Vega and his army, who want to conquer the Earth. With his friends Koji and Hikaru and later his younger sister Maria Grace, Duke decides to fight back using his best weapon - the almighty Grendizer.

For the last three years, Clay has undergone rigorous training in order to find her father, who was last seen exploring a dungeon. While dungeon exploring is difficult for any regular adventurer, Clay knows her father, a thief who doesn't purely rely on raw power or magic, managed to progress farther than anyone else. Clay sets off after him, following in his footsteps until she encounters a furnished room behind a dungeon wall. Clay is shocked to find the room is filled with monsters that can talk and a girl who claims to be the dungeons administrator. However, the room is meant to be kept hidden from explorers. Now that she knows the secret behind the dungeon, Clay is hired to be part of their staff. While she never expected to find a job in her adventure, doing so may just help Clay unravel the mystery behind her father's disappearance.

Much like the other students at her school, first-year student Saki Aoi finds herself captivated by the beauty of her senior on the school board, Makoto Hanaoka. While she worries that Hanaoka would be uncomfortable receiving a confession from another girl, Aoi musters up the courage to tell her anyway. However, Hanaoka's response surprises Aoi for a completely different reason—Hanaoka is actually a cross-dressing boy! Fully expecting Aoi to be abhorred by this revelation, Hanaoka is shocked to find that she has no issues with it. Though Hanaoka rejects Aoi's request to go out with her—citing his identity and the fact that he has never fallen in love before—Aoi insists that she will become his first love. Taken aback by Aoi's determination, Hanaoka wonders if he can really fall in love with her if he cannot find it in him to truly love himself first.