Is it alright if I will only read Kan and Shuuna's story? Will I not miss anything?

I read it before and it was ok but I didn't understand what was going on or what they were sometimes talking about but you should read the others, it's really worth it

Ohh. Okay. Thank you.

Wait... You didn't understand their story, how tho?

The story of Kan and Shuuna has it's own prequel manga named "Sabita Yoru Demo Koi Wa Sasayaku", where Kan's past had been showed and how he used to cruely abuse his ex-boyfriend. Kan used to be a seme back then. The story's more focused on his ex-boyfriend "Yumi" and how he overcomes Kan's violence and starts a new healthy realationship. You should check it out if you haven't already. Yumi deserves it, he had gone through a lot because of Kan. It's absolutely worth a reading.

As I read the prequel first and know Kan's past, it's hard for me to forgive him this easily. I wonder if Shuuna still would've accepted him if he escalated how exactly he used to treat Yumi. He kinda escaped by saying an easy sentence "I hit him." I wonder how Shuuna would've reacted if Kan actually said "I used to burn holes on his skin with cigarettes" "I used to kick him, fuck him and punch him until he bled like fountains."
I just wonder.
He never even properly apologized.

Oh and before you read Sabita Yoru Demo Koi Wa Sasayaku, you should read "Azami", where Kan and Yumi falls in love and starts their relationship. Azami is the very first story of the series.

I understood the global story at the end but it would have been easier by reading the others stories before