Seishun Buta Yarou wa Santa Claus no Yume wo Minai EP8 - Secrets and Promises

Sakuta from the other possible realm sends a message through Ikumi that reads, “Find Touko Kirishima, Mai-san is in danger.” After seeing this message, he tries contacting the Miniskirt Santa, who claimed to be Touko Kirishima. A few days later, he receives a call from her saying that she can meet on December 2nd… which also happens to be Mai’s birthday.