Chicchakute Kawaii Senpai ga Daisuki nanode 1-nichi 3-kai Teresasetai 3

is the third volume of the Chicchakute Kawaii Senpai ga Daisuki nanode 1-nichi 3-kai Teresasetai light novel series, written by Yusaku Igarashi and Illustrated by Hanekoto. It was released under the Dengeki Bunko Imprint in March 2021.

Synopsis
Ryunosuke was asked by Karin to teach her younger sister a junior high school student. In order to dispel the regrets that I couldn't see in my senior's junior high school days, when I visited my senior's house with willingness, what appeared was Hanakoi, a beautiful girl JC who loves teasing and is approaching Guigui in the exact opposite of Karin! Isn't it okay for me instead of my sister? Ryunosuke who comes out after being told! With such a younger sister's flower love, summer vacation is the sea! All the broadcasting departments who visited. Will Ryunosuke be hit by Karin in front of Karin who is shy in her swimsuit !? The third volume, in which seniors who are shy at festivals, yukata and fireworks, are so cute, suddenly develops with the participation of their teasing sisters !?

(source: Dengeki Bunko Official Website - Translated)