Because I Was Happy.The episode recounts Saki's backstory prior to the start of the series. Born with powers that other people will never understand, she was bullied at elementary school by boys who claimed that she is a witch. This culminated into an incident when one of the bullies suddenly fell unconscious after Saki was thrown onto the classroom floor. Since then, the other kids began to prejudice her, accusing her of being the perpetrator when one kid got injured. Her brother Megumi comforts her and prays for someone to end her suffering...