I saw this novel title while scrolling: I Am Not a Sis-Con! ~ All the People Around Me Call Me One, but Isn’t It Just Because My Sister Is Too Cute? ~ It's weird, because isn't he basically saying: I am not a sis-con. Because if my sister was ugly, I wouldn't be a sis-con, thus I am not a REAL sis-con! There are many novel characters who are sis-con and constantly praise their sister's beauty. But how do they know they are sis-con? All their sisters are pretty, they don't have proof they really are sis-con!