The story of The Tatami Galaxy follows an unnamed third year university student in Kyoto, Japan and what he views as his wasted time in a particular club (also called circle) at his university. He meets Ozu, another student, whose encouragement sets him on a mission of dubious morality. He contemplates his affection for a second year engineering student, Akashi, and makes promises to her, usually of and within a romantic subtext. The culmination of his dubious missions often conflict with his interest in her in some way. The story is one of a number that draw on the author's experience in Kyoto University.

[Source: Wikipedia]

DVD/BD specials for Yojouhan Shinwa Taikei.

A black haired girl is walking around the streets of Kyoto, from the night scene of Pontocho to a second-hand book fair in Shimogamo, then off to a college fair. The main character that has a romantic feeling for her secretly follows her around and looks for the opportunities to run into her in a manner that seems like a coincidence. Unfortunately for him, she is not interested in love yet so she does not notice his feelings. What awaits these two characters are crazy incidents caused by individuals such as a person who introduces himself as a Japanese mythical creature Tengu, the god of second-hand book or the money lender in a three story vehicle.

[Source: Sugoi Japan]

It is August 12th. After the remote control to his boarding house's only air conditioning unit is inadvertently destroyed by spilled cola, "I" devises a plan to return to yesterday in a time machine to recover the remote before it breaks. However, his prankster friend Ozu cannot resist playing with past events, even if it means bringing the universe to the brink of destruction. Now "I" finds himself racing through time to avoid disaster.

[Source: Disney+]