Chapter 6

Siblings is of the Koi to Yobu ni wa Kimochi Warui manga series.

Plot
Ryō Amakusa arrives home and finds Ichika Arima wearing an apron, and the latter greets him "welcome back". He believes that he accidentally might have sent the marriage registration to the registry office. However, his dream quickly fades as more women pop out of the kitchen.

It seems that Rio Amakusa's classmates are using the kitchen to finish preparations for the school's cultural festival. The girls are doing a Japanese café. Rio's classmates can't help but fall for Ryō's charm, which confuses Ichika.

While in Rio's room, the girls can't help but gush over Rio's brother sans Rio herself and Ichika. Meanwhile, Ryō is in his room trying to listen in on the girls' conversations. The girls continue to ask Rio questions about her brother. She reveals that she didn't like him very much in the past, which catches Ichiko by surprise.

Rio didn't like him because their ages were far apart, and in middle school, he hardly talked to her. There was also a time when he brought lots of trouble back home. But now they have something in common and are on good terms.

Suddenly, there's a knock on the door. It's Ryō, and he brought drinks, and what is most surprising of all, he's wearing an elegant two-piece suit. Rio questions him about his change of clothes, but Ryō quickly dismisses her and tells her that one of the mugs is specifically for Ichika. Rio hands it over to her best friend, and in the mug, Ryō wrote with the milk "Ichika-san love". The other girls are curious what kind of art she got, but Ichika quickly stirs it away with a spoon and tells them that she got an armadillo.

Characters

 * Ichika Arima
 * Ryō Amakusa
 * Rio Amakusa
 * Ruri
 * Satsuki