Love and Heart Series by Chitose Kaidō, 海道ちとせ

Sure, university freshman Yagisawa has a lot on her plate, but the last thing she expected to add was a surprise male roommate! Handsome Haruma claims to be a childhood friend, but for some reason, Yagisawa doesn't remember him at all, and his history isn't the only oddity-disturbing things begin to happen and Yagisawa may really be in over her head!

Having eased her doubts a about Haruma, Yoh starts to relax around him, not realizing that he was actually behind the stalker incident. But when Yoh begins to assist the University Students’ Union, she finds herself in trouble once again. The group’s vice president, Kunie-senpai, has a grudge against her—and he’s threatening to take it out on Sawako if she doesn’t do as he says! In desperate need of help, can she bring herself to rely on Haruma?

In the aftermath of the incident with the Students’ Union, Yoh and Haruma quickly grow close. But even as that happens, they have a chance reunion with a former classmate, Wakana. It seems she was interested in Haruma…? Meanwhile, Yoh's best friend Touya realizes his own feelings?! The tangled web of love rapidly spreads!!

After being confessed to by both Haruma and Touya, Yoh’s heart is in turmoil. Meanwhile, Wakana, showing her true colors, reveals her plan to trap Yoh…? In an amusement park where each of their expectations clash, what will Yoh decide!? The story reaches a new stage with the conclusion of Wakana's arc!