So basically this drama is about the two best friends from school time, there's Toru as ML and Koji as Second ML.

Throughout the school life whatever ML does, SML tries to replicate that, so when ML falls for Shifumi as FL even thought she was double his age, SML also thought of experimenting this (yes, this was the term he used) with the mother of his tution student hana, he gets involved with Kimiko around the same time without letting his girlfriend know.

An affair is bad no matter the reason, we don't really see the husband of Kimiko, but I find it hard to understand what was wrong with FL's marriage, her husband seem ok and he cared about her a lot. I find her attraction towards younger ML awful, it's good from story point of view but it's not logical. She had everything a woman could hope for unlike Kimiko.

Kimiko's husband was neglecting her which is why she gave herself to SML (Koji) but the same cannot be said for FL (Shifumi).

Aside from all this, I honestly didn't see much chemistry between main leads, so it was awkward to see them together, but Koji had good connection with Kimiko, throughout the drama I was watching for his relationship development.


Anyway what happened to these two main leads (Toru and Koji) is a lesson to be learned.
I won't say I like this drama as I have mixed feelings about it. Do give this a try.