The Only Thing I'd Do in a No-Boys-Allowed Game World, Vol. 2 (novel): Reincarnated as a Yuri Ship-Sinker — Ryo Hazakura

Hiiro is on a luxury liner attending Houjou Magic Academy's orientation camp, when Princess Lapis gets attacked! Hiiro is ready for this event, however, and plans to use the opportunity to give Lapis and Sakura a little push. But there's something strange going on with the enemy, and his schemes begin to fall apart. Just what will it take to get these girls together?