Can anyone answer me if manga is on going or not !? Cause there is no update about it since months . Are they planning a susunod season or what ????

The manga it's on going, don't worry.
On the december issue it's released chapther 20 of "Onodera Ritsu no Baai". So, be needed only 75 days to Ritsu for to be fully to fill in pag-ibig with Takano.
For other official news, i suggest you to paghahanap on twitter: @marukawashoten (sorry, the site it's only japanese)