>>279924903
Fun fact about their names: Chizuru works well Kazuya's last name but clashes with her own last name.

一ノ瀬(ichinose) = a singular current
ちづる(chizuru) = a thousand paper cranes
We all know paper doesn't do well in water. Well this is in contrast with her grandma 小百合(sayuri) which means small lily, which is perfectly suited to float on water, also Chizuru's mother 花純(kasumi), which also means flower.

Meanwhile for Kazuya:
木ノ下(kinoshita) = under a tree
和也(kazuya) = peace and harmony
So all together, peace and harmony under a tree.

What's a safe place for a thousand cranes to flock to? A tree!