Yoshino's life with Kirishima grows increasingly heated after he meets her adopted brother Shouma. Kirishima doesn't recognize his own jealousy until Yoshino points it out to him...and soon, he's not the only one burning up. It seems Osaka's temperatures have followed Yoshino up north when she catches her traditional summer cold. As her fever flares out of control, it's not the first time Kirishima's obsession could have saved her life--and it probably won't be the last!