This is a fanfiction of *A Song of Ice and Fire* and *Game of Thrones*. The protagonist is reborn as Mufasa Vishy, ​​the bastard son of Jaime Lannister, the "Kingslayer." He was originally supposed to be secretly killed by Cersei, but Robert, to humiliate the Lannister family, restored Mufasa's surname and even adopted him to Tyrion Lannister, the "Little Imp." "Later generations will call me the Lionheart, but I prefer them to call me the Golden Lion King. I am Mufasa Lannister, the first Master of the Lionheart Order, and the first Emperor of Westeros," Mufasa writes in his autobiography.

The Giant of Light, Ultra Seven, Glory of the Seven Gods, Monster Slayer. Accidentally arriving in the world of Game of Thrones, he becomes Ultra Seven, Count Seven's eldest son. However, thanks to a pair of genuine Seven glasses purchased for zero yuan, he gains the ability to transform into Ultraman Seven. He then discovers that this world also has monsters, so he pulls out his Seven glasses and shouts "Seven!"