Shinrin Ouja Moriking

Third-grader Shota Aikawa's pet beetle evolves from a larva to a pupa to a superhot human! The wacky adventures of the Aikawa family and the fabulous beetle who would be king now begins! You're gonna LARVA this new comedy manga!
(Source: MANGA Plus)
Included one-shot:
Volume 2: Shinrin Shuugosha Moriking