I spend time catch up previous episodes, focus on BO/romantic/special characters (like Heiji/Nagano police). Then people are excite over London arc, which just end in manga by then. So, OK I read London arc and the following cases (252, final operation room) which deal a bit follow up on London arc. Then I start to lose interest in manga and considered wait for anime. And Sera come, the rest is history, I follow manga now.
Why I'm not spoiled? I'm ok with spoil sometime (I know Jodie and Kir's identities before read the reveal). And I just just join the discussion after I start follow manga.