Ninomiya Rinko

"As your mama, I'll take good care of you and pamper you."

The wife of the Ninomiya family who lives next door to the apartment where the Hirose family lives.
She is very motherly and has a good reputation among her neighbors.
Rinko has known Ayato since he was a small child, and she is always concerned about him as if she were his own mother.
Her young son dislikes getting pampered by his mom. Because of that, she has a strong desire to thoroughly pamper Ayato, whom she has been watching since he was little.