Chocotto Sister  

chocosis, Chokotto Sister, Тёко, сестрёнка, 我的裘可妹妹, ちょこッとSister

Haruma Kawagoe does not have any siblings. His mother experienced a miscarriage during the holiday season, resulting in the loss of what would have been his baby sister. As a child, Haruma prayed for his mother's health and asked for a little sister. Despite forgetting about his request over time, Santa Claus still remembered it and decided to give him an unexpected gift: a new sibling on Christmas Day.