Amanchu!

Hello! Kozue Amano is my favorite mangaka and her currently ongoing manga - Amanchu! - is as heartwarming and laid-back as Aria. More loveable characters and a circle of close friends. Hikari Kohinata and Futaba Ooki are the main characters in the manga. Most of the manga so far details the relationship between the two girls, which seems rather romantic~

Because I loved Aria, I found that the characters resemble Akari, Alice, and Aika. The cats are also seen as a group 'president'. 

Hikari resembles Akari, they both have an out-going and happy personality.

Futaba resembles Alice, they both have a quiet and shy personality but eventually they open up.

Ai resembles Aika, they both have an energetic and fiery attitude.

Overall, Amanchu! is a very beautiful manga, good job Amano!! Amanchu! is a story of friendship, optimism, and diving!