70-oku no Hari
7 Billion Needles

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Those familiar with Parasyte would view 7 Billion Needles as something of a rip-off, should they read it. An eccentric alien entity comes from outer space, merges with the lead and slowly-but-surely comes to be friends with its host, as they battle together against other alien enemies. If you're experienced, you've read it all before. The first two volumes aren't bad - the characterisation being solid enough - but the last two turn it into a nonsensical mess that would most likely leave you with a desire to have re-read Parasyte instead. In terms of the 'merging' itself, 7BN has more in-common with Birdy than Parasyte since in both the leads die and need to rely on their new companions to survive. However, since Birdy has a human form all of her own, the relationship development isn't really very similar to what 7BN has to offer. read more 

The alien life form that could communicates with its host only. The abilities also pretty similar. TL;DR, this manga is a gender bender version of each other. 

The female MC suddenly got parasitic being that lives in their body. Then, the monstrous being shows up and started to kill people. So, the MC must fight or die 

Both are science fiction stories that contain loner main characters that are forced to help save the world. Perfect for people who dig angsty protagonists. 

Giant tentacle fights and two beings trying to save the planet. I think Inugami is on a much larger scale.