She's 49, he's 35. I have no problem with that, but someone felt the need to introduce their child versions to us, where she is portrayed by 15-year old actress so for that age gap to be consistent, he'd have to be 1. Anyways, I didn't feel it was necessary to justify the attraction by some childhood backstory.

At present, she has 18 years old son. He has his own viewpoint on his mother's relationship, which is probably supposed to be funny... Also, his line with the girl-stalker was totally unwatchable so I skipped the son entirely.

Saitoh Takumi is a bit hidden in his long hair in this one, at times he looks a bit funny but on the other hand, he'd be too hot for the woman otherwise:) There's the "Sexual Content" Tag... After the two meet, they get to be alone as soon as episode 2. At one point, she starts crying and he starts kissing:) Then they become lovers but it's heavily subtexted by the childhood backstory and that he lies about something which interrupted the viewing flow for me (but it's not that there are long or explicit bedscenes in this anyways). After some anticipation, it fell flat for me when they got together as I was not interested in all the past stuff. (Including the recent past, like the woman he dumped for the main heroine, but we keep watching her.)

The last 3 episodes, I finished them only out of courtesy. (When on the top of everything someone is revealed to have brain tumor, I really wished to turn the show off.) It was a pitty because Harada Tomoyo was really cute and attractive in this drama in her unique way, I actually liked the more the longer I watched her. And her Kasumi had enough character charm even for younger, successful man to fall for. This did not need all the added stuff (I might even say, all the added cr*p). Unfortunatelly, that got to dominate and it whole did not prove to be as sexy as it promised to be. (Even Maho got no nice scene with Kaichi.)