My top 6 favorite openings are:
1. Mune ga Doki Doki by The High Lows
2. Nazo by Miho Komatsu
3. Winter Bells by Mai Kuraki
4. Kimi to Yakusokushita Yasashii Ano Basho Made by Yuuka Saegusa
5. Girigiri Chop by B'z
6. Truth by Two-Mix
My favorite closing is:
Step by Step by Ziggy