Seasons & Episode
Professor Itsuki divides the students into two groups for the creation of different fermentation products. Oikawa discovers a secret entrance which is later no longer there. She begins to suspect that the others are hiding something from her.
Tadayasu teams up with Oikawa to find the truth about the mysterious door while Haruka is warned by her father that the time is running out for her to wrap up her research and fulfill the promise she made to him.
The Harvest Festival begins. Misato and Kawahama mount a Tequila stand resorting to suspicious tactics in their scheme to win the Grand Prize, while leaving Tadayasu and the others to attend the customers by themselves. Meanwhile, Professor Itsuki makes his move in an attempt to bring Haruka back to the University.
Haruka asks for Misato and Kawahama to take her back to Japan, but with her fiancéé's escorts looking for her, they decide to go separate ways to evade them. Sawaki confronts Marie about her relutance to inherit her family's winery despite she is so enthusiastic about her life on it, while Misato and Haruka manage to evade her pursuers and surprisingly end up having some quality time together.
Sawaki and the others bid farewell to Marie, but before departing, Sawaki have the microbes there to write a message of encouragement to her and her father. Haruka returns to confront her fiancéé just to find him ill. As she tends to his condition, the two finally comes to terms.
Follow the life of Tadayasu Sawaki as he enrolls in an Agricultural University and learn about bacteria and viruses that he alone can see with the naked eye.