Oh dear me, this manga is killing me!! I honestly don't know what to root for, the couple is cute but the age gap is enormous... And that "rival" thing... Oh god, I'm so curious.
Kinda looks like a crossover between two Ogeretsu Tanaka story, but I think it's enjoyable, though you can already predict how everything will turn out.
People need to pick up Psyche Delico mangas! That cover, dear god..!