[don_Durandal]

Finding out would have been much easier had episode 08 not been done.

Spoiler for beach babes:

There's no way the classmates wouldn't have done the "Kouichi's aunt looks way too much like Mrs. Mikami" connection at the beach. In particular with Mochizuki ogling her the whole time.

One thing is for sure, Kouichi isn't exactly the brightest detective candidate...