If you're looking for manga similar to Chii-Sui Maru Specials, you might like these titles.
Gokicha is a small, kind-hearted cockroach girl who has just moved to Hokkaido. After being despised in her previous home of Kanto, Gokicha is hoping to start afresh and befriend humans in any way she can, even if it means walking slowly so she doesn't scare anyone. Along with her daring friend Chaba, the pair explore their surroundings and reminisce about the past.
A manga about a private investigator that can talk to bugs, who takes on odd jobs from various insect clients.
The "whole country unification insect comedy" series centers on a male junior high school student named Baku who doesn't fit in with his class. He spends his days in the empty stairway to the roof of his school and calls it his "castle." One day while he is hanging out in his castle, Baku hears someone refer to his female classmate Kirin with the formal and rather antiquated term "dono." That someone happens to be a talking insect.
The transfer student, Yumekai, met a strange person who loves insects and a strange bizarre, strange creature, while being guided by butterflies dancing in the school.