"Renai Royale - Love's a battle" is a Japanese-style visual novel produced by ASa-Project, a Japanese developer of romance visual novels.

STORY

I, transfer student Hanamaru Mari, love you, Komachi Hiro-kun! Please go out with me!
Our protag, Komachi Hirotaka.
Every day, he goes through the motions-- dodging his cunning underclassman's advances, accidentally hitting on the student council president, and chasing idols.

But one day, he gets a sudden confession!
With that one declaration, she sparks a blaze of conflict around the protagonist, thawing his long-frozen heart.
How could you cast me aside and get all lovey-dovey, flirty-dirty with some random woman~!?
Do I mean nothing to you now!?

Senpai... Renna will listen to anything you say, okay?
There can only be one reason why Nii-san won't love me: those harpies swarming around him. Right?
Unbeknownst to the protagonist, sparks fly as the girls engage in a battle royale over his engagement.

All is fair in love and war, doubly so in a love war!
But who will the goddess of victory smile upon in the end?
There can only be one!

Renai X Royale - Love's a Battle achievements