A gentle Electro Seelie will guide your path near the deep pool in the center of Watatsumi Island

Just below the Sangonomiya Shrine
Hope this help
For who doesn't know about this
this is daily secret Quest in inazuma you can talk to Komaki(grandma)
she will give you a treasure's location
Day 1 will have a world quest notification ( Give her Water by walking on time )
Day 2 non-noti world quest, talk to her then she will give you follow 4 seelies
at Left watatsumi
Day 3 she will give you find Xiao symbol ( I recommend you search that quest )
Day 4 this quest
thx for reading this

grandma questkomakikomaki quest