[Sunred]

In case people are curious what each sword's name is and means:

Kaenken Rekka > Kaen means flame, ken is sword, Rekka commonly translates to wildfire.

Suiseiken Nagare > Suisei means water potential, ken is sword, and Nagare in this case means waterflow, typically the word nagare just means flow but in this case they used the characters for water and flow specifically, thus why it is waterflow.

Raimeiken Ikazuchi > Because the mei in this case is the character for "cry(鳴)" and not "bright(明)" Raimei means thunderclap, ken means sword, and Ikazuchi means lightning.

Fusouken Hayate > Fu is wind, souken means pair of swords/dual swords, and while Hayate commonly means gale, the Hayate in this case uses the kanji 翠風 instead of the common 疾風, making the translation green wind. The character 翠 is described to be a variant of the commonly known character for green 緑, usually a green hue with a slight bluish tint, and also depending on its usage can be used for the bird kingfisher.