bff turned lovers. at first, chiharu just using arou to get his life souce to appease his newly awakened succubus power. without his knowing, arou is using this opportunity to get close him since he’s in love with chiharu since they were babies. without them confessing their feelings, arou getting weaker so this lead to confession from both of them
Chihira-kun wa Maryoku ga Tarinai