Ano Natsu de Matteru

貴月イチカ

She is an alien who came to Earth to find her dream land until her ship crashlanded due to a malfunction which accidentally injures Kaito (who was near the landing point by chance) in the process. She heals him before transferring to his high school as a foreign third-year student and lives in Kaito's house after he unconsciously offers her a place to stay.

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山乃檸檬

A third-year high school student with a petite appearance and a distinctive "ufufu" laugh. She does not seek out other people until Ichika Takatsuki transfers into her class. The two girls become best friends and join the film creation project. Remon is mischievous: she proposes lewd dares in the king's game and serves alcoholic drinks. Since she claims to have written a script for Lucas in Hollywood, she ends up being the writer for the group's film, where she makes Ichika's character an alien. Manami Ogura brings her age into question, and Remon says she is "forever seventeen". When Ichika does reveal that she is an alien, Remon is extremely prepared for the resulting battles.

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谷川柑菜

An outgoing girl quick to speak her mind, Kanna is one of Kaito Kirishima's childhood friends with Tetsuro Ishigaki. She has a crush on Kaito, a fact Nanami is aware of and encourages for. Kanna helps Ichika confess her love to Kaito, at the cost of her own feelings. However, she got over it and confessed her love to Kaito despite the knowledge that he loves Ichika and accepted his rejection with a smile.

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霧島海人

A high school freshman and an avid filmmaker who constantly out recording on an 8mm handheld film camera that he inherited from his late grandfather. Others sometimes refer to him as "The Director". His parents died a long ago, so he lives with his older sister in their grandfather's house before acquiring another housemate, who is also his upperclassmen.

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北原美桜

A good friend of Kanna Tanigawa who has feelings for Tetsurō Ishigaki that her thoughts seem to innocently go in a sexual direction sometimes. She offers words of advice to Tetsurō on how to deal with his feelings for Kanna despite her own feelings towards him. After Tetsurō confesses his love for Kanna only to be rejected, Mio comforts him with her kind words.

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石垣哲郎

小倉真奈美

She is Tetsuro Ishigaki's older sister who frequently quarrels with her husband him (usually due to the simplest things), that sometimes she stays over at Tetsurō's apartment to cool down.

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霧島七海

Namami is a tall young female adult with tan skin, long black hair with two hair beads that both lay and dangle on the front, the two hair beads are different in terms of length and size, the left side is thine and small while the right side is thick large, Nanami also has light gray eyes, wears glasses and is also always shown to wear a wrist watch on her left wrist.

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樹下佳織

小倉聡