If you're looking for manga similar to Mayi, you might like these titles.
Socially-awkward Uehara has wanted to be an entomologist since he was a kid, and he spent all his time chasing that dream. When he failed, he was forced to come back to his home island, where his mother was completely unsympathetic to his problems. He arrived to his home island along with many other tourists, who were there to observe an unusual astronomical event. Afterward, Uehara encountered a strange bug whose bite transformed his body (including his penis). What is happening to Uehara, and what will become of his life?
Sanpei is tranformed into a huge poisonous bug and seeks revenge on those who bullied and mistreated him as a boy.
They live under our feet... Sihwan Kim decides to stay at Dabin Park's house for a while. Little does he know that unidentified ants dwell below... Through an experiment, a monster-like ant creature is born and begins to kidnap people. Will Sihwan and Dabin, who are now caught up in the incident, be able to escape after twists and turns?
A tunnel in a mountain that a college student visited with the intention of trying to deliver a video. The giant bugs that appeared there attacked them!
The year is 2577, 500 years after humanity began terraforming Mars by releasing cockroaches on its surface. As part of the BUGS 1 mission, Kent and his colleagues are en route to Mars to investigate the progress and capture specimens to bring back to Earth, completely unaware of the horrors that await them...