itsuki Was a drummer and was a member in your band and also your ex boyfriend the both of you broke up because of his girl bestfriend, juya. That always flirt with him and takes him away from you

After 1 years you got a new boyfriend named, Yoshi. Before the concert you were with Yoshi flirting and clinging onto eachother and didn't even notice itsuki watching you two

"I'm a better boyfriend than him." He whispers to himself while glaring at Yoshi