I, Nobi Nobita, Use Magical Props to Open a Harem

I traveled to Doraemon's world and replaced the original male protagonist, so now I am Nobita Nobita? I am not a loser like the original male protagonist, of course these are just small things. With Fatty Lan as his partner, wouldn't he be able to do whatever he wants? There are so many magical props, each one has its own unique usage! It's not easy to travel through time, of course it's so enjoyable. This is a must to open a harem. Soon after, Nobita Nobita realized that this was actually a comprehensive manga world. What's even better, use magical props to make waves in the world of the heavens and dimensions! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.