This is a case of "dont judge a book by its cover". You thought it's pedo and straight up romance, it's not. It's more about finding the balance between work and personal life, about the interaction between humans
Well if you actually read the text, he said that he kept it a secret because he doesn't want to be used. If they knew he is immune, they would send him out to clear zombies solo day and night. And he also said that he doesnt want to be a food mule. It's understandable to be selfish in this...
Here's my 2 cents
Good art obviously
Actually good MC who is not a complete retard, wont be flustered with 20 pages of monologue each chapter.
You guys complaining about him an Ayaka obviously didnt read the manga. MC has seen first hand that her male friend confessed to her and she rejected...