This manga continues to confuse me.
He said "one day" he't tell Mom the truth. Has he, then? Cause if he has told her about God, reincarnation, suffering, etc. and we have ZERO reaction from that (a scene we haven't seen), that's trash-tier writting right fucking there.
And if he hasn't, wtf does he mean "To me, not having a party or a cake was normal. I didn't even receive a song or a wish"? Uh, hello. 1yo. Of course you didn't.