Children Killing God

29 year-old Tsuji Shieri is a part-timer who lives alone with her mother who had brought her up singlehandedly. The one hour she gets for lunch is currently the only relief she gets from the gossiping of her colleagues and also from her mother's constant complaining.

And Shieri has been hiding a secret in those short time that she spends...

source: https://www.mangaupdates.com/series/3ixhjpi/kami-sama-wo-korosu-kodomotachi