Afterword

 is a bonus section included in Volume 10 of Natsumi Mukai's +Anima manga. It contains Natsumi Mukai's thoughts on the series.

Summary
Mukai starts by stating that the +Anima children have finished their journey, but now Cooro must begin a new journey of learning to be human. She doesn't believe that they will stay with Harden forever.

She goes on to talk about how much she loves drawing children, so +Anima was fun for her. She compares the ages of the characters to another of her series, Wander Wandering, noting that the +Anima children are older and act more like adults in comparison.

Mukai then discusses the children's personalities, describing Husky and Nana Alba as the type of children you often see in manga; they speak their mind, and it shows on their faces. Husky and Nana often drive the story forwards. However, she notes that the true main character is Cooro. Despite having a hard to figure out personality, he is the center of the group. Mukai's favorite stories of +Anima were Wings of the Wind (1 & 2) and The Boy Who Loved a Mermaid (1 & 2) because of Cooro's interactions with boys of different ages, and that he grew as a character. Cooro's gluttony was also a fun part for her since she also likes drawing food, despite not being a gourmet or particularly enjoying cooking herself.

Nana went through a lot of different outfits during the series, because Mukai enjoyed drawing girls' clothes. She chose to go against the immediate thought of a girl associated with bats to wear gothic lolita style clothing, and made Nana someone who loves frilly pink, cute clothes. Whenever Mukai sees someone wearing a knit hat with a flower motif, she thinks of Nana.

Mukai finishes by saying that she wants her next manga series to be about humans, and to have a more calming tone.