Ichiro Kuga is a manga artist struggling to support his two young siblings, and he's in need of an assistant. Shiori Goshiki wishes to become that assistant, but her background is unusual in more ways than one.

Ichiro learns the hard way some of the physical implications of his newfound bond with Shiori. Now that she has a permanent place to live, it's time for the two of them to do some shopping.

Shiori and Ichiro explore the ins and outs of how daily life will function under the terms of their Engagement Pact. Ichiro's friend and mentor Momoka comes over for a visit, but this has an unexpected effect on Shiori's state of mind.

Rainy weather complicates plans for Shiori and the Kugas. When Machi and Fumio are down in the dumps as a result, Ichiro and Shiori get creative in their efforts to make the most of the day's disappointing weather.

Shiori and the Kugas finally make it to the zoo, and it's Shiori's first time visiting one. It's also her first date with Ichiro since they officially became a couple, and there are unexpected hurdles to clear.

Shiori meets with mixed results when she tries to get additional assistant work with local manga artists. In an effort to encourage her, Ichiro takes a leaf from her book and decides to put his thoughts down on paper.

Shiori goes with the Kugas to visit their father's grave, as her relationship with Ichiro slowly deepens. When she comes down with a fever, it becomes Ichiro's turn to help her get back on her feet again.

It's time for the Christmas party, an annual tradition at Hiiragi Apartments. Shiori continues to grow closer to Ichiro, but she also spends time with some of the other friends she's made since her arrival.