Natsuiro Kokoro Log


Natsuiro Kokoro Log
TitleNatsuiro Kokoro Log
Original titleナツイロココロログ
Aliases夏色心跳日志, Rorolog, ロロログ
LengthMedium (10 - 30 hours)
Publishers Dramatic Create & Hearts
 AFrine Hanhuazu & Lugong Xueyuan Hanhuazu
Natsuiro Kokoro Log ~Happy Summer~


One day, Yoshito was challenged by his senpai Kisara to a match in a fighting game. Even though he was confident in his skills, she was a top ranker and beat him handily. As a result, he had to join the cyber-research club that she was the leader of. It was a relatively new club, but it soon became lively with the addition of his osananajimi and student council deputy leader Kuon, his dependable imouto Rin and classmate Kotone.

At the start of summer vacation, Yoshito was asked by the club’s advisor Kanae to help test out a love simulation game that’s in development. However, all the female avatars in the game were played by the girls in the cyber-research club! Once it was revealed that his avatar had an AI which mimicked his personality, they interacted with him in ways that they normally wouldn’t in real life. Traversing the line between reality and imagination, he could see the true feelings of the heroines who are not honest with their feelings. Their summer love story begins now.

[From Hau~ Omochikaeri!]


Main characters

Nagi Kisara
Nagi Kisara名城 綺新 
MeasurementsHeight: 160cm
Birthday24 March
Hair, Black, V Bangs, Waist Length+
Eyes, Garnet
Body, Average Height, Pale, Slim, Teen
Clothes, Bikini, Choker, Cross Necklace, Garter Belt Stockings, Gloves, Off-The-Shoulder Shirt, Sailor Suit, School Uniform, Yukata
Personality, Competitive, Naive, Tomboy, Watashi
Role, High School Student, School PC Club President, Senpai
Engages in, Computering, Martial Arts
Engages in (Sexual), Outdoor Sex, Virtual Sex
Subject of (Sexual), Missionary, Reverse Missionary, Standing Sex
Voiced byKawashima Rino


A 3rd year at the school, and leader of the computer club. She semi-forces Yoshito into the club via an online competition. For obvious reasons, she is loved in the martial arts clubs for fighting in her school uniform, which she visits regularly to hone her skills.

Ominae Rin
Ominae Rin臣苗 鈴 
MeasurementsHeight: 150cm
Birthday3 December
Hair, Brown, Long, Odango, Pink, Side Tail, Spiky Bangs, Straight, Twin Tails
Eyes, Brown, Pink
Body, Average Height, Left Handed, Pale, Slim, Teen
Clothes, Apron, Bell, Beret, Garter Belt Stockings, Hairpin, Hair Tie, Nurse's Cap, Nurse Uniform, Sailor Suit, School Uniform, Thigh-high Stockings, Yukata
Personality, Brocon, Friendly, Hardworker, Kind, Third Person
Role, Full Sister, High School Student, Kouhai, School PC Club Member, Younger Sister
Engages in (Sexual), Blowjob, Incest, Peeing, Sex in Water, Virgin Sex, Virtual Sex
Subject of (Sexual), Butterfly, Cowgirl, Quickie Fix, Sitting Sex
Voiced byKano Manaka


Yoshitos sister, who is a closet Brocon. She became that way to be a reliable sister, but her digital avatar shows her true self, one that still wants to be spoiled. Also a classmate & friend of Kotone.

Tokiwa Kuon
Tokiwa Kuon常磐 久遠 
MeasurementsHeight: 156cm
Birthday24 August
Hair, Ahoge, Intake, Odango, Red, Straight, Twin Tails, Waist Length+
Eyes, Violet
Body, Average Height, Fang, Pale, Slim, Teen
Clothes, Bikini, Mini-dress, Necklace, Ribbon Hair Tie, Sailor Suit, School Uniform, Thigh-high Stockings, Yukata
Personality, Hardworker, Outgoing, Pretending
Role, Childhood Friend, Gamer, High School Student, Kouhai, Ojousama, Popular, School PC Club Member, Senpai, Student Council Vice President
Engages in, Computering
Subject of, Bridal Carry
Engages in (Sexual), Outdoor Sex, Virgin Sex, Virtual Sex
Subject of (Sexual), Butterfly, Quickie Fix, Sitting Sex, Spoons
Voiced byYomogi Kasumi


Childhoodfriend of Yoshito and Rin, as well as the Vice President of the Student Council. Not having seen each other for quite some time, she uses the club under the cover of "supervision" to spend more time with him again.

Side characters

MeasurementsHeight: 30cm
Body, Tiny
Role, Artificial Intelligence, Robot
Voiced byYuina


Umemiya siblings'support mecha mascot. Its official name is "Electronig World Connection Device" - shortened as EWCD.

MeasurementsHeight: 154cm
Birthday10 June
Hair, Ahoge, Blond, Side Tail, Spiky Bangs
Eyes, Blue, Heterochromia, Violet
Body, Pale, Slim, Teen
Clothes, Bikini, Garter Belt Stockings, Hairpin, Skirt, Unusual Hair Ornaments
Personality, Energetic, Third Person
Role, Alter Ego, Famous, Idol
Engages in (Sexual), Group Sex, Selfcest, Virgin Sex
Subject of (Sexual), Boobjob, Seventh Posture, Sitting Sex
Voiced byYahiro Mami


A famous idol in the digital world, and the digital avatar of Kotone.
<hidden by spoiler settings>She appears to be a (close to) independent personality inside Kotone, created from her low self-esteem.They are shown to communicate via a small hand mirror Kotone carries around with herself.