I Returned to the Wrong Past, and My Childhood Friend Is an Eldritch God

The Red Moon is about to rise, and They will awaken from the abyss.

Wang Yu only wanted to enjoy college life, but an unexpected visit from his childhood friend awakened an Olden Days System.

But this Olden Days System was bugged. It mistook a bar for a potion workshop and English class for occult studies, and it identified Wang Yu's childhood friend as an eldritch god. Interacting with the eldritch god in everyday life made him stronger.

Mu Baibai: "You useless big bro, carry me upstairs!"

Wang Yu: "Your legs don't work? Donate them to someone who needs them."

[The Great Mother Goddess of Night has issued a quest. As a loyal follower, escort the Mother Goddess of Night safely back to her temple. Reward: Strength +0.1]

Wang Yu looked at Mu Baibai, who had eaten her fill and was patting her belly like a seal.

This thing is a god?

Then if I use her to farm stats, won't I be invincible?

[Lighthearted Daily Life] + [Cthulhu Mythos] + [Glitched System]