Also known as: となりの関くんじゅにあ
A 2020 slice-of-life comedy manga spin-off of Tonari No Seki-Kun by artist Morishige Takuma (Morisiget). In it Yokoi Rumi has grown up and had a child (Makuru (Tonari No Seki-Kun Junior), whose father is implied to likely be Seki Toshinari). She interacts with her sons' antics in a very similar way to how she did with Seki in the original story.