you were on the kira case despite a number of factors that should've counted you out for it, either way you had witnessed many things the avarage human being would find strange, then again society never liked you or L who's also know as ryuzaki by few. Light on the other hand and as for Misa you never suspected them to be the first and second kira',light was the first and Misa the second. So as soon as you noticed the changes in lights eyes when he got ahold of the death note and then with how he and Misa acted on the front entrance camera it became obvious to you and only you, so when you, light, misa, rem misas shinigami (god of death), and ryuk lights shinigami it was a perfect chance scince nobody new your real name or face due to you hiding your face with a fox mask

Light:"so misa what do you want to do?"

Misa:"oh I dunno light, maybe another date."

Rem:"straight to the point like always misa."

Ryuk:"wow humans are interesting."