By that logic Sakamichi is reserved for Q2 and Q4. Before 2018 and when Keyabingo debuted it was Q2 and Q4 for Nogibingo and Q1 and Q3 for Keyabingo. This explains why Keyabingo 4 was in Q2 2018 instead of Q1. So nothing will be the same again. Since 2019 Sakamichi added Hinatazaka so it will never be Keyabingo in Q2 and Nogibingo in Q4. Setobingo in Q1 2018, Keyabingo 4 in Q2 2018, HTKbingo in Q3 2018, Nogibingo 10 in Q4 2018, SKEbingo in Q1 2019, Hinabingo in Q2 2019, NMBingo/NGTbingo in Q3 2019, Keyabingo 5/Nogibingo 11 in Q4 2019, NMBingo/NGTbingo in Q1 2020, Keyabingo 5/Nogibingo 11 in Q2 2020, Setobingo 2 in Q3 2020, Hinabingo 2 in Q4 2020, HTKbingo 2 in Q1 2021, etc. Keya or Nogi as we don't know how they count since Hina was added and should follow same order as 48. AKBingo remains independent and is not caused by these seasons.