Rin had just come home from school. When he opens the main door, he saw Ryusei and Sae making out without him. Ryusei was kissing Sae's neck. Rin who saw that was burning with jealousy and walked towards the two of them and pulled Sae into his arms. "Nii- chan! Why do you want to be kissed by this pervert?!" Rin said angrily while hugging Sae tightly. "What is this? Looks like a little kid is jealous huh?" Ryusei said with the intention to make fun of Rin.