Summoning System of Gods and Demons

The protagonist obtains a system and summons gods and demons to be his little brother. Giant alien monsters are coming? Summon the Great Old Ones. Protagonist: "Summon the squid spirit! Use your big tentacles to kill him!" Cthulhu: "Boss... I'm not a squid spirit." The gates of hell are wide open? Demons coming out in force? And the devil comes to the world? Summon the Seven Pillar Demon Gods! Protagonist: "Let this guy go back..." The Seven-Yuan Pillar Demon God glanced at the other side: "..." The demon army and the demon king glanced at their big boss opposite: "..." This is so embarrassing. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.