Dans cette série, vous êtes le héros et une une fille vient dans votre chambre. Durant les épisodes 1 à 4, vous découvrirez Yui Hanasaka, une lycéenne de 17 ans venue d'​Hokkaido qui est à Tokyo pour passer des examens. Les épisodes 5 à 8 sont centrés sur Natsuki Momohara, la petite soeur du héros qui est âgée de 14 ans. Lors des épisodes 9 à 12, notre héros retrouvera par hasard son amie d'enfance de 21 ans, Moka Aoshima.

Yui with you who bame a tutor and a student from a neighbor. In a space of just two people, the distance between the hearts gradually get closer. One day, the two go to a public bath and make a small but important "promise".

Yui serves home cooking as a daily thank you to you. While having a good time, Yui was terribly depressed due to the poor results of the mock exam. One a snowy night, a small and gentle time comes to the two of them who are about to take the exam.

Yui takes the exam with the amulet you gave her. And the seasons go around, and the tree-lined road where cherry blossoms dance. Yui reveals a special secret to you walking next door. It will surely be an important moment that you will never forget. And the two are--

My sister Natsuki comes to you who is swayed by busy days. Natsuki, who came to teach her brother's life during the summer vacation, takes good care of you so that you can lead a proper life alone. This is a summer story about Natsuki and you.

Casual Conversation, day spent with someone. You will remember the warmth that you have forgotten for a ling time by being with Natsuki. Natsuki works hard for you. You prepare a special view to respond to that feeling.

Natsuki spills his true feelings on your cold words. Your younger sister, who cannot be honest, and you, who are stubborn, will know each other's thoughts for the first time. Eventually, the small but important days have come to the end of summer vacation.

You and your childhood friend Moeka, who reunited in Tokyo, are spending their days enduring the harsh conditions for each other's dream. Such a lonely person snuggles up and gets a litter warmer, this is a story of Moeka and you in a certain autumn.

Moeka supportsyou with a smile when you take a step toward your dreams. It's a fun time for just two people like when I was a kid. However, on the other hand, Moeka is worried about the reality that emerges. A slight gap was beginning to appear in their steps.

Moeka hits you unchanging kindess with inevitable irritation. In addition, I get sick due to daily strain. You who care for you and Moeka who shows weakness. A gentle moment will make Moka make a big decison.

A quiet town where you can't hear your usual singing voice. Boring days without Moeka. Eventually you start walking. In order to fulfill the promises we have made, we spin words with thought. When that word arrived, Moeka again--