@JavelinJoe if this was weekly this pacing would be just fine but the monthly pacing doesn't suit this manga especially on the slower parts like Tsukuyote New Saga
Honestly I never saw Guri and Shikimi as potential harem members. Shikimi has had some development and focus sometimes but not enough and Guri feels she is more suitable for the role of Female BFF and comedic relief.
@TetraSky I think there is only one chapter left and the epilogue.