Cat on the Hero's Lap manga volume 1 features story by Kousuke Iijima and art by Shiori.

Our brave hero, Red, has embarked alongside his companions on a journey to defeat the great demon king. Or at least, that was the plan. But then a cat sat on Red's lap and fell asleep. There's no way he can fight monsters like this! As it turns out, Red's greatest enemy is right on top of him!