Saeki Soma, a former hero who returned from another world, starts dungeon streaming to fulfill his desire for excitement. Having brought back his invincible skill from the other world to his original world, Soma realizes that being invincible alone isn’t impressive, and his popularity as a streamer is at zero. Popular streamers gain fans not because of their actual abilities, but rather their flashy techniques and appearances. Soma becomes disillusioned with a world that values only these “frauds.” Just as he was thinking of quitting dungeon streaming altogether, Soma encountered a beautiful transfer student in his class. “I am the Demon King, you know?” Introducing herself with such self-confidence, this elegant and enchanting beauty is none other than the former Demon King whom Soma defeated in the other world. She goes by the name Kazamatsuri Karin and somehow starts living at Soma’s house. Then, after watching a dungeon stream by a certain couple, she says: “I want to do a couple’s stream with you, Soma-sama!” Thus, the dungeon streaming channel “SomaRin Couple” was born, featuring the former hero and the former Demon King. The “genuine” stream by the invincible x strongest couple quickly becomes an internet sensation, gradually making their presence known to the world. This is a rise-to-fame romantic comedy where the former hero and the former Demon King become a couple’s streamer, conquering dungeons together – only the viewers (readers) will know their future. *This is a work of fiction. It has no relation to real individuals or organizations.