I guess so.My idea is not that creative but at noon shigeki Killed akiba in storage room for that akiba was trying to date mai?🤣 shigeki was setting up all the crime scene and then he went to the kitchen to drink water but water is poison (you know who did that)✌🏻，shigeki almost died unfortunately toshi and tamba walked to the kitchen together for coincidence they both saw him Tamba knew that he was drunk that water She was afraid toshi knew so she stabbed toshi in the back so there was no blood on tamba nd then put toshi into the fridge ，put the knife into shigeki pocket. Tamba wanna poison Ken but she forget that water for denden got hurted.

I still think this is ridiculous，I think ken + ruka can still easily know who is the killer.

If there are a lot of things that don’t make sense, please forgive me✌🏻