A futuristic world of a special agent academy ignites the winter of 2017! The secrets of Deep Sea Academy are about to be revealed! Sowing discord! Who exactly is CT17? Betrayal! Did Raya ultimately turn evil? Despair! What happened to Xiu in the end? Destiny! What is the true relationship between Xiaoshuai and Jill? Loyalty! Are Jill and Final just ordinary superiors and subordinates? Negligence! What's going on with Deep Sea security? Jill can freely enter and exit as Leona? Satisfaction! What will happen after Xiaoshuai wins Ling Yixiao's heart? Continue the fight! Today, break through the fog and achieve godhood with a single shot! (Source: Bangumi, translated)

Uchi no Mama ni Kagitte (Of Course, My Mom...) Upon returning home from school one day, Masamune Makabe is joyfully greeted by a young girl who he mistakes for his ever-cheerful mother. However, he quickly learns that she is actually his cousin Haruka! In fact, Haruka, his mother, and his Aunt Asae all happen to look strikingly similar to each other. Seizing the chance to reap the benefits of the situation, Masamune's sister Chinatsu persuades the three to dress up and have some fun. Tsunade Shima, Futatabi. (Tsunade Island, Once More.) Aki Adagaki invites Neko Fujinomiya, Tae Futaba, and Kojuurou Shuri back to Tsunade Island for another round of summer leisure. Missing from the trip is Masamune, who had injured himself by walking into a pole. His absence happens to evoke mixed feelings amongst the group, even perhaps a sense of loneliness. 12-Ji wo Sugita Cinderella (Cinderella After Twelve) Yoshino Koiwai is given the day off after completing her work at Tsunade Island. With the help of her sister, she receives a complete makeover and is involuntarily led to enjoy the opportunity away from her arduous maid duties. Despite having the brief freedom to finally indulge herself, Yoshino realizes there is satisfaction through other colorful ways.

Iori Kitahara moves to the coastal town of Izu for his freshman year at its university, taking residence above Grand Blue, his uncle's scuba diving shop. Iori has high hopes and dreams about having the ideal college experience, but when he enters the shop he is sucked into the alcoholic activities of the carefree members of the Diving Club who frequent the place. Persuaded by upperclassmen Shinji Tokita and Ryuujirou Kotobuki, Iori reluctantly joins their bizarre party. His cousin Chisa Kotegawa later walks in and catches him in the act, earning Iori her utter disdain. Based on Kenji Inoue and Kimitake Yoshioka's popular comedy manga, Grand Blue follows Iori's misadventures with his eccentric new friends as he strives to realize his ideal college dream, while also learning how to scuba dive.