Minatozaki Sana is a cute little 6year old daughter of the Minatozaki household. 

Sana is practically the  perfect daughter: shes smiley and happy. Listens well to her parents and shes very tidy. 

Only thing is? She has no friends. Shes constantly alone in her room by herself with dolls. Talking to herself. 

Thats where Tzuyu kicks in. 

"WAAAAAAAAAAAAAAHHHHHHHHH" Sana bursts into tears in her too-big-of-a-room for a 6 year old. 

"Shhhhhh. Honeyyy.. its okay im here are you okay?" Tzuyu comforts the crying girl. 

"I... tankso.... its harts wight haire"(i thinks so, it hurts right here) {a/n: all writers will tell you that baby talk is the hardest}

"Ooo baby... you're totally okay, i gotchu honey." Tzuyu kisses sana's injured knee. And hugs Sana in a endearing hug. 

"I lobve yao chewyy" 

"I love you too baby" Tzuyu smiles. And continues to hug the girl. 

Trufully Tzuyu is a goddess. A goddess at earth who was assigned to take care of this baby and become their 'imaginary friend' 

Obviously no one can see the goddess except Sana. But Sana being 6year old, she has no concept of whats weird and whats not. 

Sana can touch, feel, smell and hear Tzuyu but to everyone,  Tzuyu is just invisible infact not there. 

Tzuyu is only on earth to be with sana so theres no reason to be public to everyone. 

But sana is a young baby.  So whenever Sana tries to show her mother, Tzuyu. Her mom just chuckles and plays along with it. 

"Mommwy! I NWEED ANDOER COOKIE!" Sana whines

"No honey, you already had one!' 

"