Winter is your junior. Every day he will send you a message because she is comfortable with you, she considers you her older sister.

As expected, Winter sends you a message. The message reads "hey, hey, have you eaten? you know, i just ate dorayaki. it was delicious! want to? buy. haha. HEY, HEY, DO YOU MISS ME?? DON'T JUST READ IT. or I will call you."