【PC+KRKR+安卓直装】青春×好奇相伴的三角恋爱｜Sankaku Renai: Love Triangle Trouble

とある田舎町で学園生活を送る主人公・宗介は、

父親の再婚により幼少期以降、一緒に暮らす義妹の 七瑠（ななる）、幼なじみの 真帆 たちと

学園のオタク部（通称・B研）で愉快なオタクライフを満喫していた。

穏やかな毎日……

しかし、夏休みまで後ひと月に迫ったある日、事件が起きる。

「ずっと会いたかったよ……兄さん!!」

母親に引き取られ、幼少期まで一緒に暮らしていた実妹・すず が、なんと帰ってきたのだ！

学園で、家で、外で、実の妹パワーを静かに振りかざす実妹。

そして、ただひたすら気まずい義妹。

「今さら妹とか言われてもー こいつ（兄）はもう調教済みだしー ゲヘヘ」

「じゃあ、調教し直すから」

ヤバイ。俺のヤバイ妹たち。

それだけでもピンチな状況なのに、無理やり一目惚れしてきた先輩・志衣菜（しいな）が現れ、幼なじみの 真帆 の様子もなんか変だ。

どうする、どうなるこの状況 !!

宗介は暑い夏すら凍える（？）三角関係に巻き込まれるのだった――

Meet Sousuke, our protagonist. He's just your average student, living in a rural town. Ever since his father remarried when he was young, he's been living together with his little sister Nanaru.

Together with his childhood friend Maho and their other friends, they have fun geeking out at school in the Otaku Club (or the "BC," as they like to call it).

Sousuke enjoys those tranquil, peaceful days... But then one day, only one month before summer break, that peace is shattered.

"I've missed you so, so much... Nii-san!!"

It's his blood-related little sister! His beloved little sister, who had gone with their mother after the divorce, and she's back! Suzu silently flaunted her status as the 'real' sister at school, at home, and out around town, while stepsister Nanaru was just left feeling awkward and out of place.

Stepsister Nanaru: "It's too late to come in here claiming to be the 'real' sister, I've already trained him, hohoho."

Real sister Suzu: "Fine! I'll just RE-TRAIN him!!"

"This is bad. This is VERY bad. My sisters are going completely haywire!"

But if that wasn't bad enough for our poor protagonist, now some upperclassman called Shiina, who 'forced herself' to fall in love with Sousuke at first sight, appears! And if you thought the childhood friend Maho was still normal, too bad! She's acting slightly bonkers too. What is our poor protagonist going to DO?!

This is only the beginning of a wacky, zany love triangle fiasco hot enough to cool the summer heat (no guarantees).

[From NekoNyan]