Just to see that one scene. But you have to play the game again in both love and hate routes to see all the games content. You can just make sure you get it on that play-through to unlock it.
I suggest you join the discord or go to the website in order to get the guides. it'll walk you through step by step the beginning of the game to get the Himawari fly incident scene.
Yoruichi has one 'secret scene' too that can only be unlocked during one of her quests and is possible to miss.