Ep 5. Together With Onee-chan

Yui, who has been living in Britain with her family, returns to Japan for a short trip. Shinobu and Alice come to visit Yui in her apartment. Yui prepares a surprise for Shinobu and Alice by cooking Japanese food. Shinobu and Alice are very excited to try Yui's cooking. After finishing the meal, Yui's older sister, Kuzehashi Aya, comes to visit. Yui introduces Shinobu and Alice to Aya. Aya appears to be quite serious, very different from Yui's bubbly personality. As Shinobu and Alice are leaving Yui's apartment, Aya tells Shinobu that she used to live in Britain but had a difficult time adjusting to the culture, and advises Shinobu to study hard to avoid difficulties in the future. Shinobu takes Aya's advice quite seriously. The next day, Shinobu shows up at Yui's apartment after school with her textbooks. She explains that she wants to study hard to avoid having a difficult time adjusting to the culture if she ever has to live abroad. Aya is impressed by Shinobu's determination and offers to help her study. Shinobu is grateful to Aya for offering to help her study, but she is also quite intimidated by Aya's serious personality.

Meanwhile, Yui is trying to come up with a plan to make Aya and Shinobu get along better. She decides to invite them both to a tea party at her apartment. Shinobu is nervous about the tea party, but Aya reassures her that everything will be fine. Aya is surprised to see Shinobu's ability to speak fluent English. Shinobu explains that she studied English with Yui when she was in Britain. Aya expresses her admiration for Shinobu's ability to speak English despite her young age and encourages her to keep studying hard.

The tea party goes really well, and Aya and Shinobu start to become friends. Aya even starts to show a more relaxed side of her personality. After the tea party, Aya tells Yui that she is glad she came to Japan to visit her sister because she has been able to get to know Shinobu and Alice and spend time with her sister. Yui is happy to hear that Aya is enjoying her time in Japan and is getting along well with her friends.

In the end, the episode ends with Shinobu returning home and excitedly telling her mother about her newfound friendship with Aya. Shinobu's mother is happy to see her daughter so enthusiastic about her studies and her new friends. The episode ends with Shinobu looking forward to her future studies and her new friendship with Aya.

Overall, "Together With Onee-chan" is a heartwarming episode that explores the theme of friendship and cultural differences. The episode portrays how a simple act of kindness, such as studying together, can bring two people from different cultures closer together. The episode also highlights the importance of hard work and determination in achieving one's goals. The characters are well-developed, and the interactions between them are both touching and humorous. The episode is a great addition to the series, and it builds upon the strong themes and character development established in the previous episodes.