Yakumo-san wa Ezuke ga Shitai. - Vol. 9 Ch. 58 - Midnight Birthday

[MangaDex]

 

[bigk1ng]

So she had a age gap with her late husband

 

[Rara1212]

Man, why does the coach gotta be an asshole like that

 

[kmd3133]

So she had a age gap with her late husband

Of course didnt you see him being a college professor when she was 18 he was 28 i was thinking like there should be at least 7-10 years gap but author finally revealed it. This is one of the reasons that yakumo will accept 12 year age gap with yamato.