Yoshinari and Manaka have been together since they were born. The relationship between the two is a little (?) A little strange (?) Yoshinari begins to question his relationship with Manaka, but … a childhood friend love comedy that is difficult to change when it's close.
Osananajimi de Oyome-chan is a completed manga by Kouya, first published in 2017. It blends romance and comedy. You can read all 17 available chapters of Osananajimi de Oyome-chan online for free on MangaPulse; the newest is Chapter 16, added 2022-06-19. The series is finished, so you can read it from start to end in one go.