I think he can tell from the start but yeah, to protect michiru from being perceived even more by other spirits, he also pretends michiru can't see him. Because once awareness is built, it's gonna spread like wildfire
well, I think that's a guess, based on his experience and how miko act
Wait what chapter did show that??
Michiru is the tentacle girl, Miku is the MC
It's mieruko chan
Her nickname is miko
Since when does the father knows michiru can see him!!? Did i miss some crucial info??