間宮 音琴

What she calls the protagonist: Onii-chan

The youngest daughter as well as the youngest sibling of the Mamiya quintuplets. She calls her siblings all "onii-chan" and "onee-chan". She is considered as the official mascot of the quintuples at Seamore and in school. A sleepyhead and taciturn, it's always hard to tell what Nekoto is thinking about. She s also a member of the fortune telling club at school, and is quite popular due to this.

At Seamore, Nekoto is the one responsible for the drinks. At times, when requested, she'll do some fortune telling as extra work as well.

Being a mimidoshima (a person with lots of knowledge about sex), she is quite proud of her knowledge and about the fact that she knows even more than Ryouta. Nekoto is also very interested in sex and especially being the dominant one of the relationship.