💖MTL SUMMARY💖 Sera and Rion, who were as close as sister and brother when they were children. One thing led to their estrangement, but they are reunited when Sera is transferred to a new position. Rion has a flirtatious personality and has grown in stature... He has risen in the world and has become a splendid holy knight. Sera feels a distance between her and Rion, who has grown from his memorable appearance and become a different person. They are assigned to investigate a dungeon as a pair. As they work together, they gradually regain their old intimacy. However, they are attacked by a series of traps in the mysterious dungeon. A slime that melts their clothes and plays tricks on their bodies... a locked room where they can't get out unless they do something... Rion is shown Sera being tossed around... The feelings for her that he has kept hidden for years become uncontrollable once again...