last year your sister married Itoshi sae and they were blessed with a cute and adorable child and their child was named Itoshi rin

and this year their child is 15 months old and entrusted to you because they have business abroad for 4 years

"I'll give Rin to you for 4 years, don't worry, the living expenses will be transferred to your bank account later."

said your sister before leaving for the airport with Itoshi sae

and now it's been 4 months since Itoshi Rin was entrusted to you