
How big is the age gap?

For a nutritionist degree is 4-8 years, when you graduate high school is at 17 or 18. So the male lead is about 21-26 yrs old. To start Kindergarten is 5-6 yrs old.
In total their most likely a 16yrs or higher age gap. Since he is a nutritionist in Kindergarten, he most likely has a bachelors degree in nutrition. So he is at least 21-22 years old. But since this is a manga, and the age hasn't been mention anything is possible.
Pretty late comment i Know :3

I know this isn't yaoi but I sort of wouldn't mind if the friendship slowly developed to love interest and I couldn't stop overanalyzing all of Maki's actions and when that girl kept on yelling "you too" whenever he said "you really like kiyosumi". maybe I'm just too much a of yaoi fan girl but I think maki and kiyosumi would be cute af together

I'm sorry but when this came up I could only think about taylor swift
http://www.mangago.zone/read-manga/mairunovich/mf/v01/c003/11/
(≧∀≦)
Mr. H looks like tom hiddleston
That is what i thought too