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The Lake (or Park) (tentative name) is a recurring location in the 5Toubun no Hanayome series. This place is heavily based on real-life Nakanoike Park (中ノ池公園?) in Tokai, Aichi Prefecture. The lake is located presumably near the Uesugi Family's Residence due to being in a walking distance from it.
After Itsuki's sudden intrusion, she suggested for a night walk to talk with Fuutarou. At the lake, Itsuki revealed about the quintuplets' poverty prior to their mother's remarriage to Maruo Nakano as long as her inspiration to become like her mother. Additionally, Fuutarou finally revealed his reason to study. At that moment, Fuutarou sense a 'mysterious person' nearby; so far, its identity was never explicitly stated. ("The Seven Goodbyes ③")
A few days later, Fuutarou met Rena at the lake and assumed that she is the girl that he met 5 years ago in Kyoto after seeing the charm and comparing the photo to her. He was forced into a boat ride with her since she held his student handbook as hostage. Their conversation ended after the automated fountain showered onto them forced Fuutarou to roll back to the dock. Rena left the boat first and returned Fuutarou's student handbook to him; however, she took the photo and told him that she can't see him again. Trying to catch Rena, Fuutarou fell into the lake, and Rena disappeared. ("The Seven Goodbyes ④")
The lake was revisited after the Kyoto trip. Fuutarou met up with Rena - their means of contacting was never shown - and gave her his birthday present which is an album of the sisters' trip in Kyoto, secretly taken by Fuutarou, Maeda, and possibly Takeda (never shown). ("Sisters' War - Exhibition Match")
Despite knowing that it is one of the five but not knowing who, Fuutarou conveyed his gratitude toward her and her presence 5 years ago before leaving the place. A while after, Rena expressed her concern to reveal the identity of the girl from 5 years ago to someone.
- Nakanoike (中ノ池?) literally means within the lake. Another interpretation of this word is lake Nakano. The surname Nakano (中野?) translates into within the fields, despite the two share similar pronunciation. This could be a deliberate pun from the author when coming up with the Nakano surname.
- Presumably, it seems that neither the boat nor a boat-ride exists at the lake; it is just artist rendition of the location. In actuality, it seems to be illegal.