Osananajimi to wa LoveCome ni Naranai - Vol. 4 Ch. 31 - Romcoms don't happen if you laugh

[colorlesseatstomboys]

(Haru)Tomboy already best girl fr.

 

[Mithgol]

Without reading ahead and spoiling anything (despite this already being more than 50 chapters behind the latest) I can make a guess that while Haru says she's gonna support the three of them, soon she's to feel an acute pain of jealousy in her heart and understand that she also wants to be at least a part of the harem (and at best the only one) and will agonize over it.