My Little Sister's Rival Can't Come to Japan Episode 4

Kirino's track rival from her time in America, Ria Hagry, comes to Japan and stays over at her house. Kirino feels a bit protective of her, often dishing out punishment at Kyosuke following every little misunderstanding. Kirino and Kyosuke take Ria to Akihabara to show her Kirino's various hobbies. Afterwards, Ria challenges Kirino to a race, understanding what drove her to beat her back in America. Although Kyosuke cheers Kirino on, Ria manages to beat her, feeling proud of getting her revenge. Before leaving Japan, Ria hints to Kyosuke that he is the reason Kirino works so hard, though Kyosuke is a bit skeptical of that. After Ria leaves, Kirino brings up an odd request for Kyosuke to be her 'boyfriend'.