Happiness!

Haruhi Kamisaka is one of the mages in training at Mizuhosaka Academy who on Valentine's Day, runs into Yūma Kohinata, who she believes may be a boy she's been trying to find for years. After the magic section of the academy suffers from a gas explosion, Haruhi and her friends transfer over to the normal section and Haruhi ends up in Yūma's class.

A new school year has begun and the upperclassmen prepare for the entrance ceremony. Of the new students, Sumomo, Yūma's sister, is entering as a first year student. Later, Haruhi and Anri are invited by Yūma and his friends to participate in the cherry blossom viewing with them occurring the following Sunday.

The students aren't coming to the school cafeteria as often as they used to and Anri begins working as a waitress in order to bring in business. However, complications arise.

Tama-chan, Koyuki's magical wand, starts to feel that he's not very important compared to the other thousand similar Tama-chan's Koyuki has made. Tama-chan leaves Koyuki for a time because he is in doubt of her feelings towards the Tama-chans she has made.

Hachisuke thinks he has found a beautiful female ghost at school and promises to "send her to heaven." Upon revealing this knowledge to his friends, they all go with him to school at night to find out if what he saw really was a ghost and if there's anything they can do about it.

A new female student named Ibuki Shikimori transfers into Sumomo's class, though is cold towards everyone and thus has no friends. Sumomo, feeling bad for her, tries very hard to become her friend.