Everyone Learned Swordsmanship, But He Learned Swimming and Saved the Princess From the Great Flood

Rian Veyl was cut from combat training for the lowest score the Academy had ever seen: F-Rank Swimmer, Combat Value: zero. While the whole class mocked the "bathhouse cadet," nobody knew that in three days, a flood would tear through the capital and drown the kingdom's proudest army — in their own armor. When the regent princess and her infant son go under in a capsized carriage, no one can reach them. Knights sink under the weight of their steel. Mages lose their power the second the water closes over them. Only one person in the entire city can move through a flood like it's home — the same cadet they sent to sort crates in a supply shed three days earlier. But saving the baby is only the opening move. The flood isn't natural — it's engineered. A foreign observer counting seconds instead of cheering. A saboteur marking canal gates with the same symbol, again and again. A duke turning every disaster into a speech that puts the blame on anyone but himself. And somewhere beneath it all, a power that doesn't feed on water — it feeds on grief. This is a story about what happens when the "useless" skill turns out to be the only one that matters. Ranks lie. The flood doesn't. 🌊 Subscribe if you're into isekai/system stories where the "trash skill" protagonist is the only one who survives the disaster the right way.