To Love-Ru: Trial Trouble

Takes place sometime after the start of the manga. You play as Yuuki Rito who is a typical high school student. One night a girl appears in his bath and claims to be his fiance. The protagonist is faced with three trials which he must pass otherwise the Earth will be destroyed. How will he be able to cope with this new situation? Will he be able to confess to his love Sairenji or take another route? Take control and decide your own fate. All characters are over 18 (just like in Yumi Miru Kusuri).

[From Lemma Soft Forums]