Yesterday's enemies could be today's friends.

Yesterday's enemies could be today's friends., with variations such as yesterday's enemies could be today's friends and yesterday's enemy is today's friend, is a phrase in linguistical culture and surprise catch phrase by Moe in Densetsu no Starfy 3, as 『今日のテキはあすの今友』.

Moe said the phrase in relation to Ogura; who had passed away, in resentment to Starly who insensitively called him a 'bad guy'. It is known as a deep moment in the The Legendary Starfy series. In Japan, this is also related to 闇 任天堂 (Yami Nintendo), dark or more mature moments in Nintendo video games.