kayoko Toki no Kyouhaku Lyrics belongs to the anime Mermaid Forest, take a look at the argument:
According to an intriguing ancient legend, the consumption of mermaid flesh bestows immortality upon those who partake in its ethereal sustenance. Five centuries have passed since Yuta unwittingly ingested a morsel of this legendary delicacy. Determined to reclaim his humanity, he embarks on an epic odyssey through the diverse landscapes of Japan, tirelessly scouring every corner in search of a mermaid who holds the key to his transformation. Finally, the fateful encounter takes place, revealing a shocking truth: these alluring sea creatures have been nurturing a young girl, grooming her to be their own source of eternal youth through a truly unsettling ritual. In a valiant act of rescue, Yuta bravely eliminates the mermaids and liberates the girl from her grim destiny. However, it transpires that she has already consumed the flesh of the mermaids, forever altering her fate. Despite the melancholy reality of his actions, Yuta discovers solace in the newfound companionship he shares with Mana, the young girl he rescued from the clutches of mermaid captivity. Embarking on a joint quest, Yuta and Mana traverse the vast expanse of land and sea, relentlessly pursuing more mermaids in their ardent devotion to reclaim their lost humanity.