Amane lives alone in an apartment, and the most beautiful girl in school, Mahiru, lives just next door. They've almost never spoken—until the day he sees her in distress on a rainy day and lends her his umbrella. To return the favour, she offers him help around the house, and a relationship slowly begins to blossom as the distance between them closes…
Now officially dating, Amane and Mahiru surprise their classmates when they go public with their relationship.
Amane and Mahiru discuss their feelings and then spend a day at the pool, where Mahiru debuts a new swimsuit.
While visiting Amane's parents, Mahiru learns about Amane's youth and Amane runs into a figure from his past.
The family goes shopping and then Amane and Mahiru have a date at home when rain spoils their plans to go out.
After returning from their visit to Amane's hometown, Amane takes Mahiru out to see her first summer festival.
Amane and Mahiru discuss their options when a man from Mahiru's past unexpectedly shows up at their building.
Mahiru and Amane talk about next steps as they get ready for the culture festival and their class's maid café.
Mahiru and Amane get a lot of attention dressed up for their maid and butler cafe during the school festival.
Amane's parents visit the school festival and Itsuki explains why his father is unwilling to accept Chitose.
Amane worries about taking proper responsibility before he and Mahiru embark on a more intimate relationship.
Amane goes behind Itsuki's back and starts a part-time job in order to save up for a special gift for Mahiru.
Mahiru prepares a special meal for Amane on a special day, and the two clarify their feelings for each other.
