Kurumi has reunited with her childhood friend Nagio after many years. At first she's perplexed after he kissed her out of nowhere and confessed that he liked her. But soon she realizes she likes Nagio and decides to give him a kiss herself-only to have Kurumi's overprotective brother, Ataka, just happen to be there to witness it! In his anger, Ataka decides to take some extreme measures against Kurumi … ?!