Sonogo no Isshuukan Friends

**This synopsis contains spoilers from the original One Week Friends series.** Kaori Fujimiya used to be a girl who lose her friends' memory every Monday, but she managed to regain all her memories. However, high school ends and everyone follows different paths. Yuuki Hase has feelings for her, and even apart, he wants to be more than just friends, will he be able to move forward in this relationship?

Second-year high school student Shun Asakura has been together with Sana Wakatsuki since they were kids, and has had feelings for her for just as long. In fourth grade, Shun's family had to move, but he couldn't tell Sana how he felt before he left town. He's regretted putting a lid on his feelings for seven years since then, until he finally returns to the town where Sana lives. He resolves to tell Sana how he really feels. But there, he meets someone named Ayumu Fujisaki, who greatly resembles him, and what he thought of himself, like an ideal version of him. Note: Volumes each contain an extra chapter of One Week Friends, taking place after the main timeline.

This is a 4-koma featuring the high school kid Kei, and his childhood friend Rin, who loves paper airplanes. Kei seems to like Rin, though he's somewhat oblivious to his own feelings. With the addition of Rin's classmate Ryuusuke, who shares her love of paper airplanes, and another new character, Aoi, Kei's emotions become more and more complicated. Apparently feelings, like paper airplanes, don't fly straight.