I really love Tsurumi's crane motif, particularly two aspects:
1. Cranes are said to grant favours in return for acts of sacrifice
2. Cranes are monogamous and mate for life, thus represent fidelity
You can see how these play into Tsurumi's character
sometimes i feel kinda guilty having ogata as one of my favorite characters, because he is like THE most popular gk character... like nooo, i swear i dont like him js bc he is popular