MC is a college student working part-time at a supermarket. Due to her shy and plain nature, she has the image of a "side character". However, she develops feelings for her kind coworker & finds the courage to move forward.
MC meets an eccentic guy that lives a couple floors below her where his room is cluttered with all the random stuff. She takes an interest with all the things in his room and the two start a friendship that slowly turns into something more.
still mind-blown on the fact that patalliro is the longest running Shoujo manga ever since 70s with 102 volumes right now, wow. episodic story (in this case it's more of a story w/ comedy & gags) tend to have the liberty to be longer like detective conan.