Chihiro is holding a meeting at the Nekomi Tech Motor Club clubhouse, with the current subject being the drastically short funds that the group is just scraping by with. Chihiro, however, tries to lift their spirits by telling them they never know when riches (and perhaps even treasure) will show up. Trying to put their worries aside, she orders the group to clean out the clubhouse, even enlisting Tamiya and Otaki, who are hiding in the bushes nearby once more, to help. Seeing Tamiya and Otaki, Keiichi can only wonder why they are so afraid of Chihiro, and always try to hide from her.

The cleaning of the clubhouse commences, and the group is disappointed that they still have not been able to find anything valuable in the process. Fate steps in when Keiichi trips his foot against a mop propped against a wall. He tries to grab onto a picture hanging on the wall to balance himself, but the picture gives way, sending him crashing to the floor. However, the cracked frame reveals a sort of treasure map hidden behind the picture held within. (Unseen by anyone else, this makes Tamiya and Otaki very nervous. They seem to recognize it.) Belldandy examines the map and senses that it leads to something very important. The group decides to go about decoding the riddles enclosed with the treasure map, while Tamiya and Otaki (who we learn are the ones who made the map, and don’t want the others to see what’s hidden) secretly plot to get to the hidden object before the others can. If only they could remember where they had originally hidden it…

Keiichi, Belldandy, Chihiro, Hasegawa, and the others are trying to figure out the map and the clues, but so far have had no luck. There are a series of numbers written on a separate piece of paper, but no indication as to what they mean. And the map does not even tell where to start, or where the goal is located. They try various ideas to figure out the numbers (The number of steps you must take? Add them all together?), but nothing pans out. Finally, they decide on finding an official map of the campus, and comparing it to the crude hand-drawn one that they have.

However, when they leave the clubhouse, they are met by a surprising sight. Just about every student on campus has the exact same treasure map they do, and are making their own efforts to figure it out. It seems that Tamiya and Otaki have made copies of the map, and are selling it to students all over. That way, whoever eventually finds the hidden box they buried long ago, they’ll take it from them before it can be opened, and they can make a lot of money in the process.

When the group returns to the clubhouse, Keiichi is still trying to figure out the crude map, and the numbers, but still can’t make out anything that would be helpful. Just then, Belldandy realizes that the hand-made map and the official printed version they recently received overlap. They can use this to discover the starting point, which seems to be the image of a whale drawn on the official map. Keiichi is at a loss, wondering where they’ll find a whale on campus, but Chihiro reminds him of the large fountain that’s located in the center square which features a statue of a whale spraying water. Now that they have their starting point, they can easily follow the map’s directions to where the treasure is.

Following the treasure map’s directions, Keiichi and the others are led to a building on the campus. Unfortunately, now they don’t know where in the building to look. Perhaps the sheet with all the numbers holds the answer. Hasegawa tries entering the numbers in a calculator, then turning the device upside down, seeing if it the numbers form a word when you look at them from a different angle, but this proves futile. Belldandy once again comes to the rescue, discovering that when the numbers are entered into a calculator, the series of buttons seem to form a letter. For example, when you enter “37421”, the combo of buttons are entered in a formation that resembles the letter “L”. Applying this basic Cryptography to all of the numbers on the sheet spells out the word “Labokakuta”, or the “Kakuta Labs”, which is located inside the building. Our heroes now have their destination.

Keiichi, Belldandy, Chihiro, and the others race inside the lab, and begin their search, much to the protest of the students working within. Finally, they discover the location of the hidden box behind the lab’s PA speaker mounted on the wall. They remove the treasure box from inside the speaker, only to discover it’s locked. Belldandy, however, quickly discovers the combination. The box is finally opened, only to reveal a pair of rings inside. Keiichi does not think they seem very valuable, yet Chihiro seems strangely emotionally stricken by the sight of them. Belldandy notices this, and follows Chihiro, who goes off to be alone on the building’s roof.

Belldandy approaches Chihiro, presenting her the rings. She knows they belong to the Auto Club founder, as her name is engraved within each of them. Chihiro explains that the rings were given to her by both Tamiya and Otaki long ago. They had declared their love for her, but she could not decide between them. They competed for her affections, but in the end, she chose the good of the Club over their love, knowing that if she had to choose between them, it could create a rift in the Auto Club. This is why Tamiya and Otaki always get nervous around her. They still hold their feelings for her, and are embarrassed someone will find out. Belldandy assures her that their strange reactions around her are out of love, not fear, and that Chihiro should not be afraid to be a hopelessly romantic “girl” once in a while.

As for Tamiya and Otaki, they’ve passed out so many of their homemade treasure maps to the students of the campus that they can’t keep track of them all. Just then, Chihiro approaches, instantly turning the two into babbling apologetic fools, who state they only did this to make money for the Auto Club. Chihiro takes them on their offer, swiping all the money they had collected from the scheme, but also shows them that she is wearing both of the rings they had given her long ago on her finger…