Grand Blue Dreaming2

Iori Kitahara, who is staying at a diving shop in Izu, receives a letter from his younger sister, Shiori. Iori tries to write a reply to his worried sister, recalling his life at university so far, but he has nothing to report properly.

Iori's younger sister, Shiori, who knows that the contents of Iori's letter are all lies, comes barging into "Grand Blue". Dressed in traditional Japanese clothing and speaking politely, she has a calmness that makes it hard to believe she is a third-year junior high school student. In reality, she has caught all of his lewd behavior on the security camera, and has come to bring him back.

Iori and Chisa are cousins ​​but not related by blood - a new fact that the manager accidentally lets slip, leaving Aina confused and thinking that the two are already in a deep relationship! With the help of the PaB members, they set up an "impression game" to get Iori drunk and draw out his true feelings.

At Aina's suggestion, Chisa, Nanaka, and Azusa gather for a girls' day out, during which Aina hands Chisa a ticket to Aomi Women's University's school festival. However, Iori and Kohei witness this! They can't keep quiet about an all-girls university that is normally off-limits, and with a popular voice actor also making a guest appearance.

After the battle for tickets, Iori and Kohei successfully make it into the Aomi Girls' School Festival. They've researched how to hit on girls, but they somehow end up helping out the Kebakko Cafe that Aina's class is in charge of... They don't want their friends to see them dressed as maids...! However, just then, Nojima and the other four who fought over the tickets arrive.

Despite getting the tickets, Iori and his friends are kicked out of the women's college, but with Azusa's help, they manage to sneak back into the college to help set up the concert. Will they be able to turn things around and have a good time at the college?

An experiment called the "Charpy Impact Test" is conducted to see if a hammer will hit the groin. Associate Professor Midaikan says that he won't give credits if they don't succeed. How will Iori and his friends face the groin hitting challenge that will determine their credits?

Iori starts working part-time at a family restaurant to save money, and the person who becomes his senior is Busujima Sakurako, with whom he had a fight at the Aome Festival! Sakurako intimidates Iori as she begins her part-time training. However, Iori's common sense has been blown away by his life at PaB, and he becomes shirtless when greeting customers.

Iori and the others decide to go diving with their new part-time coworkers Sakurako and Otoya. While Sakurako schemes to win over Otoya, Otoya's admiration for Iori grows. After the dive, Otoya tells Chisa that he's interested in Iori, but seeing Chisa's reaction, Iori mistakenly thinks that Chisa has confessed her feelings... Has Iori's time to be popular finally come?

Iori readily accepts Aina's invitation to go on a date. With advice from her friends, Aina enjoys her date with Iori, going to the movies, shopping, and eating out. However, behind her enthusiasm, Aina has her own hidden feelings... Aina has to return to her parents' home for family reasons. When Iori hears about this from Azusa, he asks Kohei for help so that Aina can somehow stay in Izu.

A deserted island camping plan suddenly pops up! Iori and Azusa are in the mood to have fun, and excited by this rare opportunity, they rush around to gather participants. They boldly trick Kohei into joining by telling him that Kaya Mizuki is coming too, but thanks to Azusa's help, Kaya Mizuki really does join! However, there are other guests on the island...

After getting completely drunk and collapsing into the ocean, Chisa is getting changed in her tent when Iori, who happens to walk in by mistake, sees her naked.The deserted island camp comes to an end, but Chisa's behavior has been strange since then. Will their sibling-like relationship change...?!