Tsumiki Miniwa, a small girl who packs a punch, is in love with her best friend, tall and easygoing Io Otonashi. The only problem is that she can't bring herself to come out and say it. And, despite the fact that he can otherwise read her like a book, Io doesn't seem to be able to pick up the obvious clues—even with all of their friends teasing that there's no one better suited for each other. Acchi Kocchi follows Tsumiki and her circle of friends as they go through their day-to-day lives. Between Mayoi the electronics nerd, Sakaki the good-natured prankster, and the nosebleed-prone Hime, Tsumiki's friends will never let her live down her crush. But only time will tell if Tsumiki will gain the courage to finally say how she truly feels.

Green City Kazamatsuri is a city built on the ideal of a harmonious relationship between civilization and environment.. However, the peaceful Kazamatsuri will soon be faced with its annual commotion, the Harvest Festa at the turn of the year. It's an event that is much like a massive school festival, and Tennoji Kotaro decides to head out to research topics for his articles. It's an easy decision for him, because the town is filled with rumors about unidentified creature sightings and various other occult occurrences. At the same time, strange things start happening to Kotaro himself.

This is the story of a small miracle. Stars from different universes and different times that were never meant to cross paths. By irony of fate, these stars come together in “Kaginado Academy”. What awaits them there is a lively school life full of hope and dreams. The wonderful encounters provide the stars with new radiance. What awaits beyond that radiance...?

A girl named Haru Asagi works as a maid for the Miyanomori family, which is headed by one of Japan's most powerful magnates. However, the family head suddenly announces that he is retiring, so one of his six sons must assume control of the family.