Gender: Female
Birthday: May 23 (Gemini)
Height: 4'11" (152 cm)
Occupation: Student, Waitress
Affiliation: Minegahara High School, 1st year
Tomoe Koga (古賀 朋絵, Koga Tomoe) is one of the main characters of the Seishun Buta Yarou wa Bunny Girl Senpai no Yume Wo Minai series. As a result of Adolescence Syndrome, Tomoe is capable of eliciting simulated future events.
Tomoe has a solid desire to fit in and avoid being shunned, so she bears unease over her past and why she cares about her social life and status; the latter is why she is usually on her phone. After her experience with Sakuta, she learned not to focus on what others think of her and thanked him for helping her grow as a person.
During her time in a middle school in Fukuoka, Tomoe was a bumpkin who hung out with an unnoticed group in her class. However, her father was relocated, which forced her to move to Tokyo. Fearing she would be considered uncool and get bullied, she began wearing makeup, styled her hair in a fancy salon, and wore clothes from fashion magazines. She became satisfied with the result.
Tomoe encountered Sakuta Azusagawa at a playground and kicked him to defend a little girl, thinking he was a pedophile. After Sakuta cleared up the misunderstanding, she demanded he kicks her in return so they would be even.
On June 27, Tomoe found herself being asked out by Maezawa but felt too uneasy about giving him a definite reply. Unbeknownst to her, Tomoe's Adolescence Syndrome rewound time so that the events of June 27 repeated themselves.
Later that day, Tomoe was hired at Benny's and was surprised to see that Sakuta worked there. After closing time, Tomoe attempted to get Sakuta to keep up the implication they were dating but failed. However, upon revealing that she did not want to look lonely, Sakuta agreed to keep up the lie.
On July 17, Tomoe went to buy a swimsuit along with Sakuta. Later that evening, Tomoe explained that as a believable way to break up the relationship, she thought of a scenario where Sakuta never got over Mai and added that they would have the "argument" on their way back from the beach date.
At the beach, they spent their date splashing each other with water, having a sandcastle contest, and drinking slushed ice drinks. As the sun began to set, while sitting on the beach shore with Sakuta, Tomoe thanked him for everything and proclaimed the end of their "relationship." However, time was rewound to the morning of July 18.
That morning, Tomoe was questioned by Sakuta if she had experienced a time loop. In response, she claimed that she did not experience a time loop before waving him off. Later on, the two repeated their date and goodbye as it occurred previously. Still, July 18 happened a third time to repeat the same events; once again, she rewound July 18 a fourth time after she ended their false relationship.
When they went sightseeing, Sakuta told her to stop lying and that no matter how many times she rolled the dice, his feelings wouldn't change. Tomoe denounced Sakuta as a liar, responding that emotions build up the more they are repeated, at least for her. She explained that she tried to forget their experiences, couldn't bring herself to. However, with some indirect encouragement from Sakuta that nothing would change, Tomoe loudly declared that she loved him.
Now able to come to grips with reality, time rewound to the morning of June 27, revealing that everything that had happened since June 27 was a simulated future.
Unlike the initial June 27, Tomoe was able to reject Maezawa, claiming that she had feelings for someone who didn't have a smartphone.
