This is a very underrated manga for me.
Story - 9
The story abous a grown male and school girl falling in love with each other by the cause of the "worm". Expected a happy ending but in the last chapter we got revealed that the "resistance parasites" were only in Kousaka's body. Surprisingly i wasn't as sad as i expected to be when it's ended, but anyways i liked that plot twist in last chapter rather much.
Art - 9
Amazing art for this genre, coudn't say more.
Character - 10
We are shown the backstory of misanthropy and of the MCs and it's cause, also we get to see the backstory of every side characters in this title in only16 chapter, every characters is unique and feels "real".
(btw i'm not a native english speaker so there's might be some mistakes ;D)
Don't get the reason why it has only 7.8 score, obviously everyone has different opinions but for me this was a pretty good read!